502 Bad Gateway

Meaning

The upstream server returned an invalid response to the gateway.

Causes

• Upstream outage
• Invalid response format
• Network issues

How to fix

• Retry later
• Check the service status page

Example

HTTP/1.1 502 Bad Gateway

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: 502 status codeReferenceSpechttps://www.rfc-editor.org/rfc/rfc9110Open in new tab

FAQ

• Is it a CDN issue? — Often happens at proxy/gateway layers.
• What logs to check? — Inspect upstream server logs.

When to contact support

If it persists, contact the service owner.