504 Gateway Timeout

Meaning

The upstream server didn’t respond in time.

Causes

• Upstream latency
• Network delays
• Long-running operations

How to fix

• Retry later
• Contact the owner if it repeats

Example

HTTP/1.1 504 Gateway Timeout

Official references

IANA HTTP Status Code RegistryOfficialRegistryhttps://www.iana.org/assignments/http-status-codesOpen in new tab MDN HTTP response status codesReferenceDocshttps://developer.mozilla.org/en-US/docs/Web/HTTP/StatusOpen in new tab RFC 9110 (HTTP Semantics)ReferenceSpechttps://www.rfc-editor.org/rfc/rfc9110Open in new tab RFC 9110: 504 status codeReferenceSpechttps://www.rfc-editor.org/rfc/rfc9110Open in new tab

FAQ

• How is it different from 502? — 502 is invalid response, 504 is timeout.
• What if it persists? — Check upstream server health.

When to contact support

Check status/support if it’s urgent.