developer-tools
HTTP Status Code Reference
Look up common HTTP status codes locally in your browser, including meaning, category, common use, and debugging notes.
Tool workspace
The interactive tool requires JavaScript.
Instructions
2. Click "Look Up Status" to see category, meaning, common use, and a practical debugging note.
3. Use the result as a reference, then verify live behavior with your browser devtools, server logs, or monitoring system.
Enter a status code such as 404, a phrase such as not found, or a keyword such as redirect to inspect a static HTTP status reference. The tool does not request any URL or test a live server.
The HTTP Status Code Reference maps common 1xx, 2xx, 3xx, 4xx, and 5xx responses to plain-language meanings and debugging notes. It is a static browser-local reference, not a network diagnostic or uptime checker.
What this reference is for
Use it when reading API logs, browser devtools, CDN responses, redirect chains, and deployment smoke-test output. It explains common meanings without contacting the target service.
Static reference boundary
The tool does not send HTTP requests, test latency, check DNS, validate TLS, or decide whether a site is currently up. It only searches a local table of common status codes.
How to debug with the result
Start with the status class, then inspect request method, URL, headers, authentication state, response body, and server logs. A code explains the response family, but the application-specific cause still needs evidence.