504 Gateway Timeout

El servidor, actuando como gateway o proxy, no recibió una respuesta oportuna de un servidor aguas arriba que necesitaba acceder para completar la solicitud.

Source: RFC7231 Section 6.6.5

504 Code References

.NET HTTP Status Enum HttpStatusCode.GatewayTimeout
Rust HTTP Status Constant http::StatusCode::GATEWAY_TIMEOUT
Rails HTTP Status Symbol :gateway_timeout
Go HTTP Status Constant http.StatusGatewayTimeout
Symfony HTTP Status Constant Response::HTTP_GATEWAY_TIMEOUT
Python2 HTTP Status Constant httplib.GATEWAY_TIMEOUT
Python3+ HTTP Status Constant http.client.GATEWAY_TIMEOUT
Python3.5+ HTTP Status Constant http.HTTPStatus.GATEWAY_TIMEOUT