lightmy.dayINSTANT ANSWERS

Server error

HTTP 504: Gateway Timeout

HTTP 504 means a gateway timed out waiting for an upstream server.

Meaning

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

Common causes

Slow upstreams, network issues, long database queries, or too-short proxy timeouts can cause it.

What to check

Check upstream latency, gateway timeout settings, database performance, and network health.

Example response

HTTP/1.1 504 Gateway Timeout

References

Registry: IANA HTTP Status Code Registry
Spec: RFC 9110 §15.6.5
Guide: MDN 504 Gateway Timeout

Related HTTP status codes

Nearby codes often answer the next debugging question.

408 Request TimeoutHTTP 408 means the server timed out waiting for the request.502 Bad GatewayHTTP 502 means a gateway received a bad response from an upstream server.503 Service UnavailableHTTP 503 means the service is temporarily unavailable.