All HTTP status codes

HTTP 405 Method Not Allowed

Client Error

The URL exists but doesn't support the HTTP method used — e.g. POSTing to a GET-only endpoint. The Allow header lists what's permitted.

Defined in RFC 9110

Common causes

  • Calling an endpoint with the wrong verb (POST vs PUT)
  • Reverse proxy or static host blocking non-GET methods
  • Framework route defined only for specific methods

How to fix it

  1. Check the Allow response header and switch the method

  2. Register the handler for the needed method on the server

  3. Make sure intermediate proxies forward non-GET methods

Related status codes

404 Not Found

The server can't find anything at the requested URL. It says nothing about whether the resource ever existed or will exist.

501 Not Implemented

The server doesn't support the functionality required — typically an HTTP method it doesn't implement at all (contrast 405: method known, not allowed here).

Want to explore status codes interactively? Try the free HTTP Status Code Reference — search, categories and example responses, right in your browser.