Not Extended

Further extensions to the request are required for the server to fulfil it.

The 5xx class

5xx, Server errors. The server failed to fulfil a valid request: unhandled exceptions (500), broken upstreams (502), overload or maintenance (503), upstream timeouts (504). These are the codes worth monitoring and alerting on.

Monitoring for this code

Any 5xx is a server-side failure your users feel immediately. This is exactly what uptime monitoring exists for: check the endpoint from multiple regions at a short interval and alert the moment a 5xx appears, before your users report it.

Other 5xx status codes

500 Internal Server Error 501 Not Implemented 502 Bad Gateway 503 Service Unavailable 504 Gateway Timeout 505 HTTP Version Not Supported 506 Variant Also Negotiates 507 Insufficient Storage 508 Loop Detected 511 Network Authentication Required

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