Add request QUERY_STRING to server environment.

#5, php-pm/php-pm-httpkernel#14

Author: Kent Richards

Bridges/HttpKernel.php

@@ -138,6 +138,11 @@ protected static function mapRequest(ReactRequest $reactRequest, $content)
 
         $syRequest->setMethod($method);
         $syRequest->headers->replace($headers);
+
+        // Add server environment.
+        // @see http://php.net/manual/en/reserved.variables.server.php.
+        // @see http://www.faqs.org/rfcs/rfc3875.html.
+        $syRequest->server->set('QUERY_STRING', http_build_query($query));
         $syRequest->server->set('REQUEST_URI', $reactRequest->getPath());
         $syRequest->server->set('SERVER_NAME', explode(':', $headers['Host'])[0]);