diff --git a/clients/algoliasearch-client-php/lib/Algolia.php b/clients/algoliasearch-client-php/lib/Algolia.php
index 91d4adee66..c9aede0df0 100644
--- a/clients/algoliasearch-client-php/lib/Algolia.php
+++ b/clients/algoliasearch-client-php/lib/Algolia.php
@@ -10,7 +10,7 @@
 
 final class Algolia
 {
-    const VERSION = '1.0.0';
+    const VERSION = '4.0.0';
 
     /**
      * Holds an instance of the simple cache repository (PSR-16).
diff --git a/clients/algoliasearch-client-php/lib/Api/AbtestingApi.php b/clients/algoliasearch-client-php/lib/Api/AbtestingApi.php
index cc49fff7c8..988c8a2c3e 100644
--- a/clients/algoliasearch-client-php/lib/Api/AbtestingApi.php
+++ b/clients/algoliasearch-client-php/lib/Api/AbtestingApi.php
@@ -109,30 +109,13 @@ public function addABTests($addABTestsRequest)
 
         $resourcePath = '/2/abtests';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($addABTestsRequest)) {
             $httpBody = $addABTestsRequest;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation deleteABTest
@@ -157,7 +140,6 @@ public function deleteABTest($id)
 
         $resourcePath = '/2/abtests/{id}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($id !== null) {
@@ -168,24 +150,7 @@ public function deleteABTest($id)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('DELETE', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('DELETE', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getABTest
@@ -210,7 +175,6 @@ public function getABTest($id)
 
         $resourcePath = '/2/abtests/{id}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($id !== null) {
@@ -221,24 +185,7 @@ public function getABTest($id)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation listABTests
@@ -257,7 +204,6 @@ public function listABTests($offset = 0, $limit = 10)
     {
         $resourcePath = '/2/abtests';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($offset !== null) {
@@ -280,24 +226,7 @@ public function listABTests($offset = 0, $limit = 10)
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation stopABTest
@@ -322,7 +251,6 @@ public function stopABTest($id)
 
         $resourcePath = '/2/abtests/{id}/stop';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($id !== null) {
@@ -333,28 +261,13 @@ public function stopABTest($id)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
 
-    private function sendRequest($method, $resourcePath, $query, $httpBody)
+    private function sendRequest($method, $resourcePath, $queryParams, $httpBody)
     {
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
+
         if ($method === 'GET') {
             $request = $this->api->read(
                 $method,
diff --git a/clients/algoliasearch-client-php/lib/Api/AnalyticsApi.php b/clients/algoliasearch-client-php/lib/Api/AnalyticsApi.php
index 02b866ba4a..7cd5e4d415 100644
--- a/clients/algoliasearch-client-php/lib/Api/AnalyticsApi.php
+++ b/clients/algoliasearch-client-php/lib/Api/AnalyticsApi.php
@@ -119,7 +119,6 @@ public function getAverageClickPosition($index, $startDate = null, $endDate = nu
 
         $resourcePath = '/2/clicks/averageClickPosition';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -162,24 +161,7 @@ public function getAverageClickPosition($index, $startDate = null, $endDate = nu
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getClickPositions
@@ -214,7 +196,6 @@ public function getClickPositions($index, $startDate = null, $endDate = null, $t
 
         $resourcePath = '/2/clicks/positions';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -257,24 +238,7 @@ public function getClickPositions($index, $startDate = null, $endDate = null, $t
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getClickThroughRate
@@ -309,7 +273,6 @@ public function getClickThroughRate($index, $startDate = null, $endDate = null,
 
         $resourcePath = '/2/clicks/clickThroughRate';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -352,24 +315,7 @@ public function getClickThroughRate($index, $startDate = null, $endDate = null,
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getConversationRate
@@ -404,7 +350,6 @@ public function getConversationRate($index, $startDate = null, $endDate = null,
 
         $resourcePath = '/2/conversions/conversionRate';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -447,24 +392,7 @@ public function getConversationRate($index, $startDate = null, $endDate = null,
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getNoClickRate
@@ -499,7 +427,6 @@ public function getNoClickRate($index, $startDate = null, $endDate = null, $tags
 
         $resourcePath = '/2/searches/noClickRate';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -542,24 +469,7 @@ public function getNoClickRate($index, $startDate = null, $endDate = null, $tags
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getNoResultsRate
@@ -594,7 +504,6 @@ public function getNoResultsRate($index, $startDate = null, $endDate = null, $ta
 
         $resourcePath = '/2/searches/noResultRate';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -637,24 +546,7 @@ public function getNoResultsRate($index, $startDate = null, $endDate = null, $ta
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getSearchesCount
@@ -689,7 +581,6 @@ public function getSearchesCount($index, $startDate = null, $endDate = null, $ta
 
         $resourcePath = '/2/searches/count';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -732,24 +623,7 @@ public function getSearchesCount($index, $startDate = null, $endDate = null, $ta
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getSearchesNoClicks
@@ -786,7 +660,6 @@ public function getSearchesNoClicks($index, $startDate = null, $endDate = null,
 
         $resourcePath = '/2/searches/noClicks';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -849,24 +722,7 @@ public function getSearchesNoClicks($index, $startDate = null, $endDate = null,
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getSearchesNoResults
@@ -903,7 +759,6 @@ public function getSearchesNoResults($index, $startDate = null, $endDate = null,
 
         $resourcePath = '/2/searches/noResults';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -966,24 +821,7 @@ public function getSearchesNoResults($index, $startDate = null, $endDate = null,
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getStatus
@@ -1008,7 +846,6 @@ public function getStatus($index)
 
         $resourcePath = '/2/status';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -1021,24 +858,7 @@ public function getStatus($index)
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getTopCountries
@@ -1075,7 +895,6 @@ public function getTopCountries($index, $startDate = null, $endDate = null, $lim
 
         $resourcePath = '/2/countries';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -1138,24 +957,7 @@ public function getTopCountries($index, $startDate = null, $endDate = null, $lim
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getTopFilterAttributes
@@ -1193,7 +995,6 @@ public function getTopFilterAttributes($index, $search = null, $startDate = null
 
         $resourcePath = '/2/filters';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -1266,24 +1067,7 @@ public function getTopFilterAttributes($index, $search = null, $startDate = null
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getTopFilterForAttribute
@@ -1328,7 +1112,6 @@ public function getTopFilterForAttribute($attribute, $index, $search = null, $st
 
         $resourcePath = '/2/filters/{attribute}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -1409,24 +1192,7 @@ public function getTopFilterForAttribute($attribute, $index, $search = null, $st
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getTopFiltersNoResults
@@ -1464,7 +1230,6 @@ public function getTopFiltersNoResults($index, $search = null, $startDate = null
 
         $resourcePath = '/2/filters/noResults';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -1537,24 +1302,7 @@ public function getTopFiltersNoResults($index, $search = null, $startDate = null
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getTopHits
@@ -1593,7 +1341,6 @@ public function getTopHits($index, $search = null, $clickAnalytics = false, $sta
 
         $resourcePath = '/2/hits';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -1676,24 +1423,7 @@ public function getTopHits($index, $search = null, $clickAnalytics = false, $sta
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getTopSearches
@@ -1733,7 +1463,6 @@ public function getTopSearches($index, $clickAnalytics = false, $startDate = nul
 
         $resourcePath = '/2/searches';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -1826,24 +1555,7 @@ public function getTopSearches($index, $clickAnalytics = false, $startDate = nul
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getUsersCount
@@ -1878,7 +1590,6 @@ public function getUsersCount($index, $startDate = null, $endDate = null, $tags
 
         $resourcePath = '/2/users/count';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($index !== null) {
@@ -1921,28 +1632,13 @@ public function getUsersCount($index, $startDate = null, $endDate = null, $tags
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
 
-    private function sendRequest($method, $resourcePath, $query, $httpBody)
+    private function sendRequest($method, $resourcePath, $queryParams, $httpBody)
     {
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
+
         if ($method === 'GET') {
             $request = $this->api->read(
                 $method,
diff --git a/clients/algoliasearch-client-php/lib/Api/InsightsApi.php b/clients/algoliasearch-client-php/lib/Api/InsightsApi.php
index 3d6ac06bd4..36878a140d 100644
--- a/clients/algoliasearch-client-php/lib/Api/InsightsApi.php
+++ b/clients/algoliasearch-client-php/lib/Api/InsightsApi.php
@@ -108,34 +108,19 @@ public function pushEvents($insightEvents)
 
         $resourcePath = '/1/events';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($insightEvents)) {
             $httpBody = $insightEvents;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
 
-    private function sendRequest($method, $resourcePath, $query, $httpBody)
+    private function sendRequest($method, $resourcePath, $queryParams, $httpBody)
     {
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
+
         if ($method === 'GET') {
             $request = $this->api->read(
                 $method,
diff --git a/clients/algoliasearch-client-php/lib/Api/PersonalizationApi.php b/clients/algoliasearch-client-php/lib/Api/PersonalizationApi.php
index 4c94a8e159..c19f0f05f2 100644
--- a/clients/algoliasearch-client-php/lib/Api/PersonalizationApi.php
+++ b/clients/algoliasearch-client-php/lib/Api/PersonalizationApi.php
@@ -109,7 +109,6 @@ public function deleteUserProfile($userToken)
 
         $resourcePath = '/1/profiles/{userToken}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($userToken !== null) {
@@ -120,24 +119,7 @@ public function deleteUserProfile($userToken)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('DELETE', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('DELETE', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getPersonalizationStrategy
@@ -154,27 +136,9 @@ public function getPersonalizationStrategy()
     {
         $resourcePath = '/1/strategies/personalization';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getUserTokenProfile
@@ -199,7 +163,6 @@ public function getUserTokenProfile($userToken)
 
         $resourcePath = '/1/profiles/personalization/{userToken}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($userToken !== null) {
@@ -210,24 +173,7 @@ public function getUserTokenProfile($userToken)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation setPersonalizationStrategy
@@ -252,34 +198,19 @@ public function setPersonalizationStrategy($personalizationStrategyParams)
 
         $resourcePath = '/1/strategies/personalization';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($personalizationStrategyParams)) {
             $httpBody = $personalizationStrategyParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
 
-    private function sendRequest($method, $resourcePath, $query, $httpBody)
+    private function sendRequest($method, $resourcePath, $queryParams, $httpBody)
     {
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
+
         if ($method === 'GET') {
             $request = $this->api->read(
                 $method,
diff --git a/clients/algoliasearch-client-php/lib/Api/QuerySuggestionsApi.php b/clients/algoliasearch-client-php/lib/Api/QuerySuggestionsApi.php
index 91d4035d0f..d967f3b0a0 100644
--- a/clients/algoliasearch-client-php/lib/Api/QuerySuggestionsApi.php
+++ b/clients/algoliasearch-client-php/lib/Api/QuerySuggestionsApi.php
@@ -109,30 +109,13 @@ public function createConfig($querySuggestionsIndexWithIndexParam)
 
         $resourcePath = '/1/configs';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($querySuggestionsIndexWithIndexParam)) {
             $httpBody = $querySuggestionsIndexWithIndexParam;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation deleteConfig
@@ -157,7 +140,6 @@ public function deleteConfig($indexName)
 
         $resourcePath = '/1/configs/{indexName}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -168,24 +150,7 @@ public function deleteConfig($indexName)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('DELETE', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('DELETE', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getAllConfigs
@@ -202,27 +167,9 @@ public function getAllConfigs()
     {
         $resourcePath = '/1/configs';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getConfig
@@ -247,7 +194,6 @@ public function getConfig($indexName)
 
         $resourcePath = '/1/configs/{indexName}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -258,24 +204,7 @@ public function getConfig($indexName)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getConfigStatus
@@ -300,7 +229,6 @@ public function getConfigStatus($indexName)
 
         $resourcePath = '/1/configs/{indexName}/status';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -311,24 +239,7 @@ public function getConfigStatus($indexName)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getLogFile
@@ -353,7 +264,6 @@ public function getLogFile($indexName)
 
         $resourcePath = '/1/logs/{indexName}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -364,24 +274,7 @@ public function getLogFile($indexName)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation updateConfig
@@ -413,7 +306,6 @@ public function updateConfig($indexName, $querySuggestionsIndexParam)
 
         $resourcePath = '/1/configs/{indexName}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -424,31 +316,17 @@ public function updateConfig($indexName, $querySuggestionsIndexParam)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($querySuggestionsIndexParam)) {
             $httpBody = $querySuggestionsIndexParam;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('PUT', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('PUT', $resourcePath, $queryParams, $httpBody);
     }
 
-    private function sendRequest($method, $resourcePath, $query, $httpBody)
+    private function sendRequest($method, $resourcePath, $queryParams, $httpBody)
     {
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
+
         if ($method === 'GET') {
             $request = $this->api->read(
                 $method,
diff --git a/clients/algoliasearch-client-php/lib/Api/RecommendApi.php b/clients/algoliasearch-client-php/lib/Api/RecommendApi.php
index 8d595cfed1..03c62856e5 100644
--- a/clients/algoliasearch-client-php/lib/Api/RecommendApi.php
+++ b/clients/algoliasearch-client-php/lib/Api/RecommendApi.php
@@ -108,34 +108,19 @@ public function getRecommendations($getRecommendationsParams)
 
         $resourcePath = '/1/indexes/*/recommendations';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($getRecommendationsParams)) {
             $httpBody = $getRecommendationsParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
 
-    private function sendRequest($method, $resourcePath, $query, $httpBody)
+    private function sendRequest($method, $resourcePath, $queryParams, $httpBody)
     {
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
+
         if ($method === 'GET') {
             $request = $this->api->read(
                 $method,
diff --git a/clients/algoliasearch-client-php/lib/Api/SearchApi.php b/clients/algoliasearch-client-php/lib/Api/SearchApi.php
index 26c4526328..e896c2b7e2 100644
--- a/clients/algoliasearch-client-php/lib/Api/SearchApi.php
+++ b/clients/algoliasearch-client-php/lib/Api/SearchApi.php
@@ -110,30 +110,13 @@ public function addApiKey($apiKey)
 
         $resourcePath = '/1/keys';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($apiKey)) {
             $httpBody = $apiKey;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation addOrUpdateObject
@@ -172,7 +155,6 @@ public function addOrUpdateObject($indexName, $objectID, $body)
 
         $resourcePath = '/1/indexes/{indexName}/{objectID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -191,27 +173,11 @@ public function addOrUpdateObject($indexName, $objectID, $body)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($body)) {
             $httpBody = $body;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('PUT', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('PUT', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation appendSource
@@ -236,30 +202,13 @@ public function appendSource($source)
 
         $resourcePath = '/1/security/sources/append';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($source)) {
             $httpBody = $source;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation assignUserId
@@ -295,7 +244,6 @@ public function assignUserId($xAlgoliaUserID, $assignUserIdParams)
 
         $resourcePath = '/1/clusters/mapping';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($xAlgoliaUserID !== null) {
@@ -308,27 +256,11 @@ public function assignUserId($xAlgoliaUserID, $assignUserIdParams)
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($assignUserIdParams)) {
             $httpBody = $assignUserIdParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation batch
@@ -360,7 +292,6 @@ public function batch($indexName, $batchWriteParams)
 
         $resourcePath = '/1/indexes/{indexName}/batch';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -371,27 +302,11 @@ public function batch($indexName, $batchWriteParams)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($batchWriteParams)) {
             $httpBody = $batchWriteParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation batchAssignUserIds
@@ -427,7 +342,6 @@ public function batchAssignUserIds($xAlgoliaUserID, $batchAssignUserIdsParams)
 
         $resourcePath = '/1/clusters/mapping/batch';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($xAlgoliaUserID !== null) {
@@ -440,27 +354,11 @@ public function batchAssignUserIds($xAlgoliaUserID, $batchAssignUserIdsParams)
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($batchAssignUserIdsParams)) {
             $httpBody = $batchAssignUserIdsParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation batchDictionaryEntries
@@ -492,7 +390,6 @@ public function batchDictionaryEntries($dictionaryName, $batchDictionaryEntriesP
 
         $resourcePath = '/1/dictionaries/{dictionaryName}/batch';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($dictionaryName !== null) {
@@ -503,27 +400,11 @@ public function batchDictionaryEntries($dictionaryName, $batchDictionaryEntriesP
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($batchDictionaryEntriesParams)) {
             $httpBody = $batchDictionaryEntriesParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation batchRules
@@ -557,7 +438,6 @@ public function batchRules($indexName, $rule, $forwardToReplicas = null, $clearE
 
         $resourcePath = '/1/indexes/{indexName}/rules/batch';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($forwardToReplicas !== null) {
@@ -588,27 +468,11 @@ public function batchRules($indexName, $rule, $forwardToReplicas = null, $clearE
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($rule)) {
             $httpBody = $rule;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation browse
@@ -634,7 +498,6 @@ public function browse($indexName, $browseRequest = null)
 
         $resourcePath = '/1/indexes/{indexName}/browse';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -645,27 +508,11 @@ public function browse($indexName, $browseRequest = null)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($browseRequest)) {
             $httpBody = $browseRequest;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation clearAllSynonyms
@@ -691,7 +538,6 @@ public function clearAllSynonyms($indexName, $forwardToReplicas = null)
 
         $resourcePath = '/1/indexes/{indexName}/synonyms/clear';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($forwardToReplicas !== null) {
@@ -712,24 +558,7 @@ public function clearAllSynonyms($indexName, $forwardToReplicas = null)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation clearObjects
@@ -754,7 +583,6 @@ public function clearObjects($indexName)
 
         $resourcePath = '/1/indexes/{indexName}/clear';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -765,24 +593,7 @@ public function clearObjects($indexName)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation clearRules
@@ -808,7 +619,6 @@ public function clearRules($indexName, $forwardToReplicas = null)
 
         $resourcePath = '/1/indexes/{indexName}/rules/clear';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($forwardToReplicas !== null) {
@@ -829,24 +639,7 @@ public function clearRules($indexName, $forwardToReplicas = null)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation deleteApiKey
@@ -871,7 +664,6 @@ public function deleteApiKey($key)
 
         $resourcePath = '/1/keys/{key}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($key !== null) {
@@ -882,24 +674,7 @@ public function deleteApiKey($key)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('DELETE', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('DELETE', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation deleteBy
@@ -931,7 +706,6 @@ public function deleteBy($indexName, $searchParams)
 
         $resourcePath = '/1/indexes/{indexName}/deleteByQuery';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -942,27 +716,11 @@ public function deleteBy($indexName, $searchParams)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($searchParams)) {
             $httpBody = $searchParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation deleteIndex
@@ -987,7 +745,6 @@ public function deleteIndex($indexName)
 
         $resourcePath = '/1/indexes/{indexName}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -998,24 +755,7 @@ public function deleteIndex($indexName)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('DELETE', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('DELETE', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation deleteObject
@@ -1047,7 +787,6 @@ public function deleteObject($indexName, $objectID)
 
         $resourcePath = '/1/indexes/{indexName}/{objectID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -1066,24 +805,7 @@ public function deleteObject($indexName, $objectID)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('DELETE', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('DELETE', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation deleteRule
@@ -1116,7 +838,6 @@ public function deleteRule($indexName, $objectID, $forwardToReplicas = null)
 
         $resourcePath = '/1/indexes/{indexName}/rules/{objectID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($forwardToReplicas !== null) {
@@ -1145,24 +866,7 @@ public function deleteRule($indexName, $objectID, $forwardToReplicas = null)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('DELETE', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('DELETE', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation deleteSource
@@ -1187,7 +891,6 @@ public function deleteSource($source)
 
         $resourcePath = '/1/security/sources/{source}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($source !== null) {
@@ -1198,24 +901,7 @@ public function deleteSource($source)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('DELETE', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('DELETE', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation deleteSynonym
@@ -1248,7 +934,6 @@ public function deleteSynonym($indexName, $objectID, $forwardToReplicas = null)
 
         $resourcePath = '/1/indexes/{indexName}/synonyms/{objectID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($forwardToReplicas !== null) {
@@ -1277,24 +962,7 @@ public function deleteSynonym($indexName, $objectID, $forwardToReplicas = null)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('DELETE', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('DELETE', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getApiKey
@@ -1319,7 +987,6 @@ public function getApiKey($key)
 
         $resourcePath = '/1/keys/{key}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($key !== null) {
@@ -1330,24 +997,7 @@ public function getApiKey($key)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getDictionaryLanguages
@@ -1364,27 +1014,9 @@ public function getDictionaryLanguages()
     {
         $resourcePath = '/1/dictionaries/*/languages';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getDictionarySettings
@@ -1401,27 +1033,9 @@ public function getDictionarySettings()
     {
         $resourcePath = '/1/dictionaries/*/settings';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getLogs
@@ -1446,7 +1060,6 @@ public function getLogs($offset = 0, $length = 10, $indexName = 'null', $type =
 
         $resourcePath = '/1/logs';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($offset !== null) {
@@ -1489,24 +1102,7 @@ public function getLogs($offset = 0, $length = 10, $indexName = 'null', $type =
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getObject
@@ -1539,7 +1135,6 @@ public function getObject($indexName, $objectID, $attributesToRetrieve = null)
 
         $resourcePath = '/1/indexes/{indexName}/{objectID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($attributesToRetrieve !== null) {
@@ -1568,24 +1163,7 @@ public function getObject($indexName, $objectID, $attributesToRetrieve = null)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getObjects
@@ -1610,30 +1188,13 @@ public function getObjects($getObjectsParams)
 
         $resourcePath = '/1/indexes/*/objects';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($getObjectsParams)) {
             $httpBody = $getObjectsParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getRule
@@ -1665,7 +1226,6 @@ public function getRule($indexName, $objectID)
 
         $resourcePath = '/1/indexes/{indexName}/rules/{objectID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -1684,24 +1244,7 @@ public function getRule($indexName, $objectID)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getSettings
@@ -1726,7 +1269,6 @@ public function getSettings($indexName)
 
         $resourcePath = '/1/indexes/{indexName}/settings';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -1737,24 +1279,7 @@ public function getSettings($indexName)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getSources
@@ -1771,27 +1296,9 @@ public function getSources()
     {
         $resourcePath = '/1/security/sources';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getSynonym
@@ -1823,7 +1330,6 @@ public function getSynonym($indexName, $objectID)
 
         $resourcePath = '/1/indexes/{indexName}/synonyms/{objectID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -1842,24 +1348,7 @@ public function getSynonym($indexName, $objectID)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getTask
@@ -1891,7 +1380,6 @@ public function getTask($indexName, $taskID)
 
         $resourcePath = '/1/indexes/{indexName}/task/{taskID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -1910,24 +1398,7 @@ public function getTask($indexName, $taskID)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getTopUserIds
@@ -1944,27 +1415,9 @@ public function getTopUserIds()
     {
         $resourcePath = '/1/clusters/mapping/top';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation getUserId
@@ -1992,7 +1445,6 @@ public function getUserId($userID)
 
         $resourcePath = '/1/clusters/mapping/{userID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($userID !== null) {
@@ -2003,24 +1455,7 @@ public function getUserId($userID)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation hasPendingMappings
@@ -2038,7 +1473,6 @@ public function hasPendingMappings($getClusters = null)
     {
         $resourcePath = '/1/clusters/mapping/pending';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($getClusters !== null) {
@@ -2051,24 +1485,7 @@ public function hasPendingMappings($getClusters = null)
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation listApiKeys
@@ -2085,27 +1502,9 @@ public function listApiKeys()
     {
         $resourcePath = '/1/keys';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation listClusters
@@ -2122,27 +1521,9 @@ public function listClusters()
     {
         $resourcePath = '/1/clusters';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation listIndices
@@ -2160,7 +1541,6 @@ public function listIndices($page = null)
     {
         $resourcePath = '/1/indexes';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($page !== null) {
@@ -2173,24 +1553,7 @@ public function listIndices($page = null)
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation listUserIds
@@ -2209,7 +1572,6 @@ public function listUserIds($page = null, $hitsPerPage = 100)
     {
         $resourcePath = '/1/clusters/mapping';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($page !== null) {
@@ -2232,24 +1594,7 @@ public function listUserIds($page = null, $hitsPerPage = 100)
             }
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('GET', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('GET', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation multipleBatch
@@ -2274,30 +1619,13 @@ public function multipleBatch($batchParams)
 
         $resourcePath = '/1/indexes/*/batch';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($batchParams)) {
             $httpBody = $batchParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation multipleQueries
@@ -2322,30 +1650,13 @@ public function multipleQueries($multipleQueriesParams)
 
         $resourcePath = '/1/indexes/*/queries';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($multipleQueriesParams)) {
             $httpBody = $multipleQueriesParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation operationIndex
@@ -2377,7 +1688,6 @@ public function operationIndex($indexName, $operationIndexParams)
 
         $resourcePath = '/1/indexes/{indexName}/operation';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -2388,27 +1698,11 @@ public function operationIndex($indexName, $operationIndexParams)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($operationIndexParams)) {
             $httpBody = $operationIndexParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation partialUpdateObject
@@ -2448,7 +1742,6 @@ public function partialUpdateObject($indexName, $objectID, $oneOfStringBuiltInOp
 
         $resourcePath = '/1/indexes/{indexName}/{objectID}/partial';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($createIfNotExists !== null) {
@@ -2477,27 +1770,11 @@ public function partialUpdateObject($indexName, $objectID, $oneOfStringBuiltInOp
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($oneOfStringBuiltInOperation)) {
             $httpBody = $oneOfStringBuiltInOperation;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation removeUserId
@@ -2525,7 +1802,6 @@ public function removeUserId($userID)
 
         $resourcePath = '/1/clusters/mapping/{userID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($userID !== null) {
@@ -2536,24 +1812,7 @@ public function removeUserId($userID)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('DELETE', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('DELETE', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation replaceSources
@@ -2578,30 +1837,13 @@ public function replaceSources($source)
 
         $resourcePath = '/1/security/sources';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($source)) {
             $httpBody = $source;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('PUT', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('PUT', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation restoreApiKey
@@ -2626,7 +1868,6 @@ public function restoreApiKey($key)
 
         $resourcePath = '/1/keys/{key}/restore';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($key !== null) {
@@ -2637,24 +1878,7 @@ public function restoreApiKey($key)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation saveObject
@@ -2686,7 +1910,6 @@ public function saveObject($indexName, $body)
 
         $resourcePath = '/1/indexes/{indexName}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -2697,27 +1920,11 @@ public function saveObject($indexName, $body)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($body)) {
             $httpBody = $body;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation saveRule
@@ -2757,7 +1964,6 @@ public function saveRule($indexName, $objectID, $rule, $forwardToReplicas = null
 
         $resourcePath = '/1/indexes/{indexName}/rules/{objectID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($forwardToReplicas !== null) {
@@ -2786,27 +1992,11 @@ public function saveRule($indexName, $objectID, $rule, $forwardToReplicas = null
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($rule)) {
             $httpBody = $rule;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('PUT', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('PUT', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation saveSynonym
@@ -2846,7 +2036,6 @@ public function saveSynonym($indexName, $objectID, $synonymHit, $forwardToReplic
 
         $resourcePath = '/1/indexes/{indexName}/synonyms/{objectID}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($forwardToReplicas !== null) {
@@ -2875,27 +2064,11 @@ public function saveSynonym($indexName, $objectID, $synonymHit, $forwardToReplic
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($synonymHit)) {
             $httpBody = $synonymHit;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('PUT', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('PUT', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation saveSynonyms
@@ -2929,7 +2102,6 @@ public function saveSynonyms($indexName, $synonymHit, $forwardToReplicas = null,
 
         $resourcePath = '/1/indexes/{indexName}/synonyms/batch';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($forwardToReplicas !== null) {
@@ -2960,27 +2132,11 @@ public function saveSynonyms($indexName, $synonymHit, $forwardToReplicas = null,
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($synonymHit)) {
             $httpBody = $synonymHit;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation search
@@ -3012,7 +2168,6 @@ public function search($indexName, $searchParams)
 
         $resourcePath = '/1/indexes/{indexName}/query';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -3023,27 +2178,11 @@ public function search($indexName, $searchParams)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($searchParams)) {
             $httpBody = $searchParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation searchDictionaryEntries
@@ -3075,7 +2214,6 @@ public function searchDictionaryEntries($dictionaryName, $searchDictionaryEntrie
 
         $resourcePath = '/1/dictionaries/{dictionaryName}/search';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($dictionaryName !== null) {
@@ -3086,27 +2224,11 @@ public function searchDictionaryEntries($dictionaryName, $searchDictionaryEntrie
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($searchDictionaryEntriesParams)) {
             $httpBody = $searchDictionaryEntriesParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation searchForFacetValues
@@ -3139,7 +2261,6 @@ public function searchForFacetValues($indexName, $facetName, $searchForFacetValu
 
         $resourcePath = '/1/indexes/{indexName}/facets/{facetName}/query';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -3158,27 +2279,11 @@ public function searchForFacetValues($indexName, $facetName, $searchForFacetValu
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($searchForFacetValuesRequest)) {
             $httpBody = $searchForFacetValuesRequest;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation searchRules
@@ -3210,7 +2315,6 @@ public function searchRules($indexName, $searchRulesParams)
 
         $resourcePath = '/1/indexes/{indexName}/rules/search';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($indexName !== null) {
@@ -3221,27 +2325,11 @@ public function searchRules($indexName, $searchRulesParams)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($searchRulesParams)) {
             $httpBody = $searchRulesParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation searchSynonyms
@@ -3270,7 +2358,6 @@ public function searchSynonyms($indexName, $query = '', $type = null, $page = 0,
 
         $resourcePath = '/1/indexes/{indexName}/synonyms/search';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($query !== null) {
@@ -3321,24 +2408,7 @@ public function searchSynonyms($indexName, $query = '', $type = null, $page = 0,
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation searchUserIds
@@ -3363,30 +2433,13 @@ public function searchUserIds($searchUserIdsParams)
 
         $resourcePath = '/1/clusters/mapping/search';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($searchUserIdsParams)) {
             $httpBody = $searchUserIdsParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('POST', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('POST', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation setDictionarySettings
@@ -3411,30 +2464,13 @@ public function setDictionarySettings($dictionarySettingsParams)
 
         $resourcePath = '/1/dictionaries/*/settings';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($dictionarySettingsParams)) {
             $httpBody = $dictionarySettingsParams;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('PUT', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('PUT', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation setSettings
@@ -3467,7 +2503,6 @@ public function setSettings($indexName, $indexSettings, $forwardToReplicas = nul
 
         $resourcePath = '/1/indexes/{indexName}/settings';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
 
         if ($forwardToReplicas !== null) {
@@ -3488,27 +2523,11 @@ public function setSettings($indexName, $indexSettings, $forwardToReplicas = nul
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($indexSettings)) {
             $httpBody = $indexSettings;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('PUT', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('PUT', $resourcePath, $queryParams, $httpBody);
     }
     /**
      * Operation updateApiKey
@@ -3540,7 +2559,6 @@ public function updateApiKey($key, $apiKey)
 
         $resourcePath = '/1/keys/{key}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         // path params
         if ($key !== null) {
@@ -3551,31 +2569,17 @@ public function updateApiKey($key, $apiKey)
             );
         }
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         if (isset($apiKey)) {
             $httpBody = $apiKey;
         }
 
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
-
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
-
-        return $this->sendRequest('PUT', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('PUT', $resourcePath, $queryParams, $httpBody);
     }
 
-    private function sendRequest($method, $resourcePath, $query, $httpBody)
+    private function sendRequest($method, $resourcePath, $queryParams, $httpBody)
     {
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
+
         if ($method === 'GET') {
             $request = $this->api->read(
                 $method,
diff --git a/clients/algoliasearch-client-php/lib/Configuration/Configuration.php b/clients/algoliasearch-client-php/lib/Configuration/Configuration.php
index 3ff4f0d094..44c1de0eb7 100644
--- a/clients/algoliasearch-client-php/lib/Configuration/Configuration.php
+++ b/clients/algoliasearch-client-php/lib/Configuration/Configuration.php
@@ -26,11 +26,11 @@ abstract class Configuration
     protected $accessToken = '';
 
     /**
-     * User agent of the HTTP request, set to "OpenAPI-Generator/{version}/PHP" by default
+     * User agent of the HTTP request (by default it is autogenerated)
      *
      * @var string
      */
-    protected $userAgent = 'OpenAPI-Generator/1.0.0/PHP';
+    protected $userAgent = null;
 
     /**
      * Debug switch (default set to false)
diff --git a/clients/algoliasearch-client-php/lib/RequestOptions/RequestOptionsFactory.php b/clients/algoliasearch-client-php/lib/RequestOptions/RequestOptionsFactory.php
index f02eca5c7e..5f23b630b8 100644
--- a/clients/algoliasearch-client-php/lib/RequestOptions/RequestOptionsFactory.php
+++ b/clients/algoliasearch-client-php/lib/RequestOptions/RequestOptionsFactory.php
@@ -68,7 +68,9 @@ private function normalize($options)
             'headers' => [
                 'X-Algolia-Application-Id' => $this->config->getAppId(),
                 'X-Algolia-API-Key' => $this->config->getAlgoliaApiKey(),
-                'User-Agent' => $this->config->getUserAgent() ? $this->config->getUserAgent() : UserAgent::get(),
+                'User-Agent' => $this->config->getUserAgent() !== null ?
+                  $this->config->getUserAgent() :
+                  UserAgent::get(),
                 'Content-Type' => 'application/json',
             ],
             'query' => [],
diff --git a/clients/algoliasearch-client-php/lib/RetryStrategy/ApiWrapper.php b/clients/algoliasearch-client-php/lib/RetryStrategy/ApiWrapper.php
index ce4d782241..e008c5e32b 100644
--- a/clients/algoliasearch-client-php/lib/RetryStrategy/ApiWrapper.php
+++ b/clients/algoliasearch-client-php/lib/RetryStrategy/ApiWrapper.php
@@ -28,11 +28,6 @@ final class ApiWrapper implements ApiWrapperInterface
      */
     private $http;
 
-    /**
-     * @var Configuration
-     */
-    private $config;
-
     /**
      * @var \Algolia\AlgoliaSearch\RetryStrategy\ClusterHosts
      */
@@ -61,7 +56,6 @@ public function __construct(
         LoggerInterface $logger = null
     ) {
         $this->http = $http;
-        $this->config = $config;
         $this->clusterHosts = $clusterHosts;
         $this->requestOptionsFactory = $RqstOptsFactory ?: new RequestOptionsFactory($config);
         $this->logger = $logger ?: Algolia::getLogger();
diff --git a/templates/php/Configuration.mustache b/templates/php/Configuration.mustache
index 2fa87b1468..d541a3f51e 100644
--- a/templates/php/Configuration.mustache
+++ b/templates/php/Configuration.mustache
@@ -26,11 +26,11 @@ abstract class Configuration
     protected $accessToken = '';
 
     /**
-     * User agent of the HTTP request, set to "OpenAPI-Generator/{version}/PHP" by default
+     * User agent of the HTTP request (by default it is autogenerated)
      *
      * @var string
      */
-    protected $userAgent = '{{{httpUserAgent}}}{{^httpUserAgent}}OpenAPI-Generator/{{{artifactVersion}}}{{^artifactVersion}}1.0.0{{/artifactVersion}}/PHP{{/httpUserAgent}}';
+    protected $userAgent = null;
 
     /**
      * Debug switch (default set to false)
diff --git a/templates/php/api.mustache b/templates/php/api.mustache
index 7784cc69df..eeb45f4bf4 100644
--- a/templates/php/api.mustache
+++ b/templates/php/api.mustache
@@ -219,7 +219,6 @@ use {{invokerPackage}}\RetryStrategy\ClusterHosts;
 
         $resourcePath = '{{{path}}}';
         $queryParams = [];
-        $headerParams = [];
         $httpBody = [];
         {{#queryParams}}
 
@@ -249,17 +248,6 @@ use {{invokerPackage}}\RetryStrategy\ClusterHosts;
         }
         {{/isExplode}}
         {{/queryParams}}
-        {{#headerParams}}
-        // header params
-        {{#collectionFormat}}
-        if (is_array(${{paramName}})) {
-            ${{paramName}} = ObjectSerializer::serializeCollection(${{paramName}}, '{{collectionFormat}}');
-        }
-        {{/collectionFormat}}
-        if (${{paramName}} !== null) {
-            $headerParams['{{baseName}}'] = ObjectSerializer::toHeaderValue(${{paramName}});
-        }
-        {{/headerParams}}
         {{#pathParams}}
         // path params
         {{#collectionFormat}}
@@ -276,47 +264,11 @@ use {{invokerPackage}}\RetryStrategy\ClusterHosts;
         }
         {{/pathParams}}
 
-        $headers = [];
-        $headers['Accept'] = 'application/json';
-        $headers['Content-Type'] = 'application/json';
         {{#bodyParams}}
         if (isset(${{paramName}})) { 
             $httpBody = ${{paramName}};
         } 
         {{/bodyParams}}
-        {{#authMethods}}
-        {{#isBasic}}
-        {{#isBasicBasic}}
-        // this endpoint requires HTTP basic authentication
-        if (!empty($this->config->getUsername()) || !(empty($this->config->getPassword()))) {
-            $headers['Authorization'] = 'Basic ' . base64_encode($this->config->getUsername() . ":" . $this->config->getPassword());
-        }
-        {{/isBasicBasic}}
-        {{#isBasicBearer}}
-        // this endpoint requires Bearer{{#bearerFormat}} ({{{.}}}){{/bearerFormat}} authentication (access token)
-        if ($this->config->getAccessToken() !== null) {
-            $headers['Authorization'] = 'Bearer ' . $this->config->getAccessToken();
-        }
-        {{/isBasicBearer}}
-        {{/isBasic}}
-        {{#isOAuth}}
-        // this endpoint requires OAuth (access token)
-        if ($this->config->getAccessToken() !== null) {
-            $headers['Authorization'] = 'Bearer ' . $this->config->getAccessToken();
-        }
-        {{/isOAuth}}
-        {{/authMethods}}
-
-        $defaultHeaders = [];
-        if ($this->config->getUserAgent()) {
-            $defaultHeaders['User-Agent'] = $this->config->getUserAgent();
-        }
-
-        $headers = array_merge(
-            $defaultHeaders,
-            $headerParams,
-            $headers
-        );
 
         {{#servers.0}}
         $operationHosts = [{{#servers}}"{{{url}}}"{{^-last}}, {{/-last}}{{/servers}}];
@@ -326,14 +278,15 @@ use {{invokerPackage}}\RetryStrategy\ClusterHosts;
         $operationHost = $operationHosts[$this->hostIndex];
 
         {{/servers.0}}
-        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
 
-        return $this->sendRequest('{{httpMethod}}', $resourcePath, $query, $httpBody);
+        return $this->sendRequest('{{httpMethod}}', $resourcePath, $queryParams, $httpBody);
     }
     {{/operation}}
 
-    private function sendRequest($method, $resourcePath, $query, $httpBody)
+    private function sendRequest($method, $resourcePath, $queryParams, $httpBody)
     {
+        $query = \GuzzleHttp\Psr7\Query::build($queryParams);
+
         if($method == 'GET') {
             $request = $this->api->read(
                 $method,