Ergo\Http\ResponseBuilder::setStatusCode PHP Method

    public function setStatusCode($code)
    {
        $this->_status = new Status($code);
        return $this;
    }

 /**
  * Builds a response object
  */
 protected function buildResponse($e)
 {
     // build a response
     $responseBuilder = new Http\ResponseBuilder();
     return $responseBuilder->setStatusCode(500)->notCachable()->setBody($this->buildResponseBody($e))->build();
 }