feat: Add HTTPClient option

client.go

@@ -74,7 +74,11 @@ type ClientOptions struct {
 	Environment string
 	// Maximum number of breadcrumbs.
 	MaxBreadcrumbs int
+	// An optional pointer to `http.Client` that will be used with a default HTTPTransport.
+	// Using your own client will make HTTPTransport, HTTPProxy, HTTPSProxy and CaCerts options ignored.
+	HTTPClient *http.Client
 	// An optional pointer to `http.Transport` that will be used with a default HTTPTransport.
+	// Using your own transport will make HTTPProxy, HTTPSProxy and CaCerts options ignored.
 	HTTPTransport *http.Transport
 	// An optional HTTP proxy to use.
 	// This will default to the `http_proxy` environment variable.

transport.go

@@ -143,9 +143,13 @@ func (t *HTTPTransport) Configure(options ClientOptions) {
 		}
 	}
 
-	t.client = &http.Client{
-		Transport: t.transport,
-		Timeout:   t.Timeout,
+	if options.HTTPClient != nil {
+		t.client = options.HTTPClient
+	} else {
+		t.client = &http.Client{
+			Transport: t.transport,
+			Timeout:   t.Timeout,
+		}
 	}
 
 	t.start.Do(func() {
@@ -276,9 +280,13 @@ func (t *HTTPSyncTransport) Configure(options ClientOptions) {
 		}
 	}
 
-	t.client = &http.Client{
-		Transport: t.transport,
-		Timeout:   t.Timeout,
+	if options.HTTPClient != nil {
+		t.client = options.HTTPClient
+	} else {
+		t.client = &http.Client{
+			Transport: t.transport,
+			Timeout:   t.Timeout,
+		}
 	}
 }