/**
  * @param  MethodResponse                                   $response
  * @return Response
  * @throws \Seven\RpcBundle\Exception\UnknownMethodResponse
  */
 public function createHttpResponse(MethodResponse $response)
 {
     $data = array('jsonrpc' => '2.0');
     if ($response instanceof MethodReturn) {
         $data['result'] = $response->getReturnValue();
     } elseif ($response instanceof MethodFault) {
         $data['error'] = array('code' => $response->getCode(), 'message' => $response->getMessage());
     } else {
         throw new UnknownMethodResponse("Unknown MethodResponse instance");
     }
     if ($response->getCallId()) {
         $data['id'] = $response->getCallId();
     }
     return new Response(json_encode($data), 200, array('content-type' => 'text/json'));
 }