HTTP Status Code and 404 Error Lookup
Find the meaning of common HTTP response codes and what they usually suggest during debugging.
About this tool
HTTP status codes explain how a server responded to a browser, crawler, API client, or fetch request. A code can point toward a redirect, missing page, permission issue, server failure, or rate limit. This lookup gives short practical notes so you can decide what to inspect next without digging through a long specification every time.
How to use it
- Search by code, phrase, or class such as redirect, client error, or server error.
- Read the meaning and practical note, then check request headers, URL, permissions, or server logs as needed.
- Use the class filter when you only know whether the problem is in the 300, 400, or 500 range.
Tips and common mistakes
- A 404 can be a broken link, a removed page, or a routing rule that does not match.
- A 301 or 302 should be checked for loops and unexpected canonical destinations.
- A 500-level response usually needs server-side logs rather than only browser troubleshooting.
FAQ
Does this test my URL?
No. It is a lookup table, not a live HTTP checker.
Why are there many redirect codes?
Redirect codes preserve different behavior around permanence and request methods.
Should users see raw status codes?
Usually no. User-facing pages should explain the problem in plain language.
Related tools
HTTP 404, 200, redirect, and server error codes
Search by code or meaning, or open the HTTP Status Code Lookup and enter 404 Not Found. The expanded table covers common informational, success, redirect, client-error, and server-error responses.
This is a reference lookup. It does not send a live request, test a URL, inspect redirects, check uptime, read response headers, or diagnose the server. Confirm current protocol details in the specification or platform documentation used by the application.