/**
  * Send a DELETE request with JSON-encoded parameters.
  *
  * @param string $path              Request path.
  * @param array $parameters         POST parameters to be JSON encoded.
  * @param array $requestHeaders     Request headers.
  */
 protected function delete($path, array $parameters = array(), $requestHeaders = array())
 {
     $response = $this->client->getHttpClient()->delete($path, $this->createJsonBody($parameters), $requestHeaders);
     return ResponseMediator::getContent($response);
 }