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405 4xx RFC 9110 §15.5.6

Method Not Allowed

Resource exists but doesn't support the HTTP method used. Response must include Allow header.

What HTTP 405 means

RFC 9110 §15.5.6. The endpoint exists but rejects this method (e.g., POST to a read-only endpoint). The Allow header in the response lists supported methods.

Typical causes

  • POST to GET-only endpoint
  • DELETE on a read-only resource
  • Wrong HTTP verb in client code