Searchable HTTP code reference.. HTTP Status Codes is a free online tool from the ToolsRift Developer Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.
Search by number or name to find any HTTP status code, its category (informational, success, redirect, client or server error) and a short explanation of when it applies.
301 is a permanent redirect that browsers and search engines cache; 302 is temporary and the original URL should stay in use.
401 means the request is unauthenticated (log in), while 403 means authenticated but not permitted to access the resource.
Server-error responses like 500 Internal Server Error and 503 Service Unavailable indicate the server failed to fulfill a valid request.