504 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

504 Code references

Go HTTP Status Constant http.StatusGatewayTimeout
Python3+ HTTP Status Constant http.client.GATEWAY_TIMEOUT
Python3.5+ HTTP Status Constant http.HTTPStatus.GATEWAY_TIMEOUT
Rails HTTP Status Symbol :gateway_timeout
Symfony HTTP Status Constant Response::HTTP_GATEWAY_TIMEOUT

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