diff --git a/src/HttpApi/Controllers/Controller.php b/src/HttpApi/Controllers/Controller.php
index 43f2ebd..92315c2 100644
--- a/src/HttpApi/Controllers/Controller.php
+++ b/src/HttpApi/Controllers/Controller.php
@@ -9,6 +9,7 @@ use GuzzleHttp\Psr7\Response;
 use Ratchet\ConnectionInterface;
 use Illuminate\Http\JsonResponse;
 use GuzzleHttp\Psr7\ServerRequest;
+use Illuminate\Support\Collection;
 use Ratchet\Http\HttpServerInterface;
 use Psr\Http\Message\RequestInterface;
 use BeyondCode\LaravelWebSockets\Apps\App;
@@ -19,6 +20,15 @@ use BeyondCode\LaravelWebSockets\WebSockets\Channels\ChannelManager;
 
 abstract class Controller implements HttpServerInterface
 {
+    /** @var string */
+    protected $requestBuffer = '';
+
+    /** @var RequestInterface */
+    protected $request;
+
+    /** @var int */
+    protected $contentLength;
+
     /** @var \BeyondCode\LaravelWebSockets\WebSockets\Channels\ChannelManager */
     protected $channelManager;
 
@@ -29,28 +39,51 @@ abstract class Controller implements HttpServerInterface
 
     public function onOpen(ConnectionInterface $connection, RequestInterface $request = null)
     {
-        $serverRequest = (new ServerRequest(
-            $request->getMethod(),
-            $request->getUri(),
-            $request->getHeaders(),
-            $request->getBody(),
-            $request->getProtocolVersion()
-        ))->withQueryParams(QueryParameters::create($request)->all());
+        $this->request = $request;
 
-        $laravelRequest = Request::createFromBase((new HttpFoundationFactory)->createRequest($serverRequest));
+        $this->contentLength = $this->findContentLength($request->getHeaders());
 
-        $this
-            ->ensureValidAppId($laravelRequest->appId)
-            ->ensureValidSignature($laravelRequest);
+        $this->requestBuffer = (string)$request->getBody();
 
-        $response = $this($laravelRequest);
+        $this->checkContentLength($connection);
+    }
 
-        $connection->send(JsonResponse::create($response));
-        $connection->close();
+    protected function findContentLength(array $headers): int
+    {
+        return Collection::make($headers)->first(function ($values, $header) {
+            return strtolower($header) === 'content-length';
+        });
     }
 
     public function onMessage(ConnectionInterface $from, $msg)
     {
+        $this->requestBuffer .= $msg;
+
+        $this->checkContentLength();
+    }
+
+    protected function checkContentLength(ConnectionInterface $connection)
+    {
+        if (strlen($this->requestBuffer) === $this->contentLength) {
+            $serverRequest = (new ServerRequest(
+                $this->request->getMethod(),
+                $this->request->getUri(),
+                $this->request->getHeaders(),
+                $this->requestBuffer,
+                $this->request->getProtocolVersion()
+            ))->withQueryParams(QueryParameters::create($this->request)->all());
+
+            $laravelRequest = Request::createFromBase((new HttpFoundationFactory)->createRequest($serverRequest));
+
+            $this
+                ->ensureValidAppId($laravelRequest->appId)
+                ->ensureValidSignature($laravelRequest);
+
+            $response = $this($laravelRequest);
+
+            $connection->send(JsonResponse::create($response));
+            $connection->close();
+        }
     }
 
     public function onClose(ConnectionInterface $connection)