/** * * @param RequestEnvelope $requestEnvelope * @return RequestEnvelope */ private function attachBasicHeadersToRequest(RequestEnvelope $requestEnvelope) { $requestEnvelope->setAppIdHeader($this->appId); $requestEnvelope->setAppVersionHeader($this->appVersion); $requestEnvelope->setContentTypeHeader(Header::FORMAT_APPLICATION_JSON); $requestEnvelope->setAcceptHeader(Header::FORMAT_APPLICATION_JSON); return $requestEnvelope; }