/** * Any implementing HTTP providers should send a request to the provided endpoint with the parameters. * They should return, in string form, the response body and throw an exception on error. * * @param UriInterface $endpoint * @param mixed $requestBody * @param array $extraHeaders * @param string $method * * @return string * * @throws TokenResponseException * @throws \InvalidArgumentException */ public function retrieveResponse(UriInterface $endpoint, $requestBody, array $extraHeaders = array(), $method = 'POST') { // Normalize method name $method = strtoupper($method); $this->normalizeHeaders($extraHeaders); if ($method === 'GET' && !empty($requestBody)) { throw new \InvalidArgumentException('No body expected for "GET" request.'); } if (!isset($extraHeaders['Content-type']) && $method === 'POST' && is_array($requestBody)) { $extraHeaders['Content-type'] = 'Content-type: application/x-www-form-urlencoded'; } $host = 'Host: ' . $endpoint->getHost(); // Append port to Host if it has been specified if ($endpoint->hasExplicitPortSpecified()) { $host .= ':' . $endpoint->getPort(); } $extraHeaders['Host'] = $host; $extraHeaders['Connection'] = 'Connection: close'; if (is_array($requestBody)) { $requestBody = http_build_query($requestBody, '', '&'); } $extraHeaders['Content-length'] = 'Content-length: ' . strlen($requestBody); $context = $this->generateStreamContext($requestBody, $extraHeaders, $method); $level = error_reporting(0); $response = file_get_contents($endpoint->getAbsoluteUri(), false, $context); error_reporting($level); if (false === $response) { $lastError = error_get_last(); if (is_null($lastError)) { throw new TokenResponseException('Failed to request resource.'); } throw new TokenResponseException($lastError['message']); } return $response; }