ErrorFindly
4054xx Client ErrorMedium

HTTP 405 Method Not Allowed

Defined in RFC 7231

What Does HTTP 405 Mean?

The request method is known by the server but is not supported by the target resource.

Common Causes

  1. 1Using POST on a GET-only endpoint
  2. 2Sending PUT/DELETE to a read-only resource
  3. 3API endpoint doesn't support the HTTP method used
  4. 4Misconfigured route handlers

Impact

  • ⚠Form submission fails
  • ⚠API operation is rejected

Developer Fix

For web developers and application engineers

  1. 1Check API documentation for allowed methods
  2. 2Use the correct HTTP method for the operation
  3. 3Check the Allow header in the 405 response for supported methods

Server Admin Fix

For system administrators and DevOps engineers

  1. 1Ensure route handlers accept the correct HTTP methods
  2. 2Return proper Allow header listing supported methods
  3. 3Review CORS preflight configuration

Frequently Asked Questions

How do I know which methods are allowed?
The server should include an Allow header in the 405 response listing the supported methods (e.g., Allow: GET, POST, HEAD). Check this header or consult the API documentation.
Why do I get 405 on a valid endpoint?
The endpoint exists but doesn't accept the HTTP method you used. For example, you might be sending POST to an endpoint that only accepts GET. Check your request method.

Related HTTP Status Codes

400Bad Request501Not Implemented

About the Author

Web Infrastructure Team

Verified against official RFC specifications and real-world server configurations. HTTP status code behavior confirmed across Apache, Nginx, and Cloudflare.