← All HTTP status codes
511
Network Authentication Required
The client must authenticate to gain network access — typical of captive portals.
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.
Get alerted the moment your API returns a 5xx
ContinuumNexus checks your endpoints from multiple regions and emails you as soon as a status code goes wrong.