About the HTTP Status Codes Reference
A free, complete, searchable reference for every standard HTTP status code.
What it is
This reference covers the full set of standard HTTP status codes from RFC 9110 (HTTP Semantics), plus WebDAV extensions and widely-used unofficial codes like 418. Every entry includes the code, its official name, class, a plain-English description, and a note on when you'd typically see it in practice.
Features
Complete dataset
Every 1xx-5xx status code, bundled locally at build time — no runtime fetch.
Instant search
Search by code number or by keyword in the name, description, or usage note.
Class filters
Filter to just 1xx, 2xx, 3xx, 4xx, or 5xx, combinable with the search box.
Color and label coded
Each class has a distinct colour badge plus a text label, never colour alone.
Deep links and copy
Every code has a stable URL fragment and one-click copy for the code or full string.
Fully client-side
All data is static and bundled — nothing is fetched or transmitted.
The five status code classes
HTTP status codes are grouped into five classes by their first digit: 1xx informational responses, 2xx successful responses, 3xx redirection messages, 4xx client errors, and 5xx server errors. Knowing which class a code belongs to is often enough to understand the general shape of the problem before reading the specific code.