---
set: 5
code: 504
title: Gateway Timeout
references:
    "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"
---

The server, while acting as a gateway or proxy, did not receive a timely response from an upstream server it needed to access in order to complete the request.

---

* Source: [RFC7231 Section 6.6.5][1]

[1]: <http://tools.ietf.org/html/rfc7231#section-6.6.5>