HTTP Status Code Reference
Look up common HTTP status codes locally in your browser, including meaning, category, common use, and debugging notes.
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.
Browser-local processing
HTTP Status Code Reference
How to use
Finish in three steps
- 01
Paste a three-digit HTTP status code, a reason phrase, or a debugging keyword.
- 02
Click "Look Up Status" to see category, meaning, common use, and a practical debugging note.
- 03
Use the result as a reference, then verify live behavior with your browser devtools, server logs, or monitoring system.
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.
FAQ
About this tool
Does this tool test a website or API endpoint?
No. It is a static browser-local reference and never sends a request to the URL or service you are debugging.
Can I paste a full response line such as HTTP/1.1 404?
Yes. The lookup extracts a three-digit code from common response-line text and returns the matching reference entry.
Does a 5xx status always mean my client is correct?
Not always. 5xx responses usually point to server-side or upstream failure, but a malformed or expensive client request can still trigger server failures.
Does the reference include every registered HTTP code?
No. It focuses on common codes used in debugging. For standards work, compare with the current RFC and platform documentation.
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