diff --git a/docker/runtime/golang/kubeless.tpl.go b/docker/runtime/golang/kubeless.tpl.go
index de4489fdb..699ab447d 100644
--- a/docker/runtime/golang/kubeless.tpl.go
+++ b/docker/runtime/golang/kubeless.tpl.go
@@ -126,6 +126,7 @@ func handler(w http.ResponseWriter, r *http.Request) {
 		EventNamespace: r.Header.Get("event-namespace"),
 		Extensions: functions.Extension{
 			Request: r,
+			Response: w,
 			Context: ctx,
 		},
 	}
diff --git a/docker/runtime/nodejs/kubeless.js b/docker/runtime/nodejs/kubeless.js
index 9e66b5fdd..8be50753b 100644
--- a/docker/runtime/nodejs/kubeless.js
+++ b/docker/runtime/nodejs/kubeless.js
@@ -84,7 +84,7 @@ function modExecute(handler, req, res, end) {
             'event-time': req.get('event-time'),
             'event-namespace': req.get('event-namespace'),
             data,
-            'extensions': { request: req },
+            'extensions': { request: req, response: res },
         };
         Promise.resolve(func(event, context))
         // Finalize
diff --git a/docker/runtime/php/Controller.php b/docker/runtime/php/Controller.php
index ee1d91995..88c2983a3 100644
--- a/docker/runtime/php/Controller.php
+++ b/docker/runtime/php/Controller.php
@@ -40,7 +40,7 @@ public function __construct()
    *
    * @return void
    */
-  private function runFunction(Request $request)
+  private function runFunction(Request $request, Response $response)
   {
       set_time_limit($this->timeout);
       ob_start();
@@ -63,12 +63,14 @@ private function runFunction(Request $request)
           'event-namespace' => $_SERVER['HTTP_EVENT_NAMESPACE'],
           'extensions' => (object) array(
             'request' => $request,
+            'response' => $response,
           )
         );
         $res = call_user_func($this->function, $event, $this->functionContext);
+        $event->extensions->response->getBody()->write($res);
         ob_end_clean();
         chdir($this->currentDir);
-        return $res;
+        return $event->extensions->response;
       } else {
           sleep($this->timeout);
           posix_kill($pid, SIGKILL);
@@ -106,10 +108,8 @@ public function root(Request $request, Response $response, array $args)
   {
     try {
       $this->validate();
-      $ret = $this->runFunction($request);
-      $response->getBody()->write($ret);
 
-      return $response;
+      return $this->runFunction($request, $response);
     } catch (\Kubeless\TimeoutFunctionException $e) {
       $res = $response->withStatus(408);
 
diff --git a/docs/kubeless-functions.md b/docs/kubeless-functions.md
index 5ccbd4768..0787d0061 100644
--- a/docs/kubeless-functions.md
+++ b/docs/kubeless-functions.md
@@ -16,6 +16,7 @@ event:
   event-namespace: "kafkatriggers.kubeless.io"  # Event emitter
   extensions:                                   # Optional parameters
     request: ...                                # Reference to the request received 
+    response: ...                               # Reference to the response to send 
                                                 # (specific properties will depend on the function language)
 context:
     function-name: "pubsub-nodejs"
diff --git a/kubeless-non-rbac.jsonnet b/kubeless-non-rbac.jsonnet
index c91806d88..c6f97d568 100644
--- a/kubeless-non-rbac.jsonnet
+++ b/kubeless-non-rbac.jsonnet
@@ -106,13 +106,13 @@ local runtime_images ='[
       {
         "name": "node6",
         "version": "6",
-        "runtimeImage": "kubeless/nodejs@sha256:61c5a10aacb709c4575a09a4aa28f822b2d008c0dbf4aa0b124705ee9ca143f9",
+        "runtimeImage": "kubeless/nodejs@sha256:0a8a72af4cc3bfbfd4fe9bd309cbf486e7493d0dc32a691673b3f0d3fae07487",
         "initImage": "node:6.10"
       },
       {
         "name": "node8",
         "version": "8",
-        "runtimeImage": "kubeless/nodejs@sha256:fc1aa96e55116400ee13d664a655dfb2025ded91858ebfd5fc0c8f0d6b923eba",
+        "runtimeImage": "kubeless/nodejs@sha256:76ee28dc7e3613845fface2d1c56afc2e6e2c6d6392c724795a7ccc2f5e60582",
         "initImage": "node:8"
       }
     ],
@@ -140,7 +140,7 @@ local runtime_images ='[
       {
         "name": "php72",
         "version": "7.2",
-        "runtimeImage": "kubeless/php@sha256:4e44ab60f597e93097bf9f5ea91d58bd9c308bf206043db2a9809ec16a8ff2f4",
+        "runtimeImage": "kubeless/php@sha256:b605bb6b5ae3b1a2a93570939296618904259d7767a14002fa9733e66d59849b",
         "initImage": "composer:1.6"
       }
     ],
@@ -155,7 +155,7 @@ local runtime_images ='[
         "name": "go1.10",
         "version": "1.10",
         "runtimeImage": "kubeless/go@sha256:bf72622344a54e4360f31d3fea5eb9dca2c96fbedc6f0ad7c54f3eb8fb7bd353",
-        "initImage": "kubeless/go-init@sha256:e262f70639594b3a9e3481843171ecbbe82e84b786825ebe28bc1a3ae89310d3"
+        "initImage": "kubeless/go-init@sha256:d0812c4e8351bfd95d0574efd23613cff2664d6a57af4ed0a20ebc651382d476"
       }
     ],
     "depName": "Gopkg.toml",
diff --git a/pkg/functions/params.go b/pkg/functions/params.go
index 87fa86105..c1c9f93ba 100644
--- a/pkg/functions/params.go
+++ b/pkg/functions/params.go
@@ -23,8 +23,9 @@ import (
 
 // Extension includes a reference to the Event request and its Context (to handle timeouts)
 type Extension struct {
-	Request *http.Request
-	Context context.Context
+	Request  *http.Request
+	Response http.ResponseWriter
+	Context  context.Context
 }
 
 // Event includes information about the event source