private function fetchResumeUri()
 {
     $result = null;
     $body = $this->request->getBody();
     if ($body) {
         $headers = array('content-type' => 'application/json; charset=UTF-8', 'content-length' => $body->getSize(), 'x-upload-content-type' => $this->mimeType, 'x-upload-content-length' => $this->size, 'expect' => '');
         foreach ($headers as $key => $value) {
             $this->request->setHeader($key, $value);
         }
     }
     $response = $this->client->getHttpClient()->send($this->request);
     $location = $response->getHeader('location');
     $code = $response->getStatusCode();
     if (200 == $code && true == $location) {
         return $location;
     }
     $message = $code;
     $body = $response->json();
     if (isset($body['error']['errors'])) {
         $message .= ': ';
         foreach ($body['error']['errors'] as $error) {
             $message .= "{$error[domain]}, {$error[message]};";
         }
         $message = rtrim($message, ';');
     }
     $error = "Failed to start the resumable upload (HTTP {$message})";
     $this->client->getLogger()->error($error);
     throw new Google_Exception($error);
 }