HTTP 504 Gateway Timeout

A gateway or proxy did not receive a timely response from an upstream server.

Use 504 when an upstream dependency times out before your gateway can complete the request.

httpstatus codeserver errortimeout

Response (http)

HTTP/1.1 504 Gateway Timeout

Use 504 when an upstream dependency times out before your gateway can complete the request.

Common mistakes

Letting gateways hang without timeouts, or blaming the client for an upstream timeout.

Registry reference: RFC9110, Section 15.6.5

Sources