HTTP Status Code Reference

Look up any HTTP status code

HTTP status codes signal the outcome of a request, and remembering what each means is impractical. This searchable reference covers the codes from 1xx to 5xx, colour-coded by class, so you can find and understand any status code quickly.

Why the classes matter

Status codes are organised into ranges that tell you the nature of the response at a glance: 2xx means success, 3xx redirection, 4xx a client error (something wrong with the request), and 5xx a server error. Knowing the class immediately narrows down whose problem it is, before you even read the specific code. The specific codes then add detail, a 404 is a missing resource, a 401 needs authentication, a 429 is rate limiting. Having them searchable and colour-coded turns a status code from a mystery into an immediate diagnosis.

Diagnose at a glance

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