-constant.html">GATEWAY_TIMEOUT</a></li>
      <li><a href="dart-io/HttpStatus/GONE-constant.html">GONE</a></li>
      <li><a href="dart-io/HttpStatus/HTTP_VERSION_NOT_SUPPORTED-constant.html">HTTP_VERSION_NOT_SUPPORTED</a></li>
      <li><a href="dart-io/HttpStatus/INTERNAL_SERVER_ERROR-constant.html">INTERNAL_SERVER_ERROR</a></li>
      <li><a href="dart-io/HttpStatus/LENGTH_REQUIRED-constant.html">LENGTH_REQUIRED</a></li>
      <li><a href="dart-io/HttpStatus/METHOD_NOT_ALLOWED-constant.html">METHOD_NOT_