What does HTTP status 405 (Bad Method) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: HTTP 405 means the target resource exists but does not support the request method used.

Could be also:
Constant	Type	OS
ERROR_NOT_A_CLOUD_SYNC_ROOT	Win32 error	Windows
SMB_SERVER_LIVEDUMP	BugCheck Code	Windows

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HTTP_STATUS_NOT_FOUND	HTTP_STATUS_NONE_ACCEPTABLE

HTTP_STATUS_BAD_METHOD

A 405 response must include an Allow header listing the methods currently supported by that resource. It differs from 501, which says the server does not implement required functionality at all.

Inspect the endpoint-specific method contract and any method override middleware. Changing a path alone will not fix a method policy or route configuration mismatch.

A compliant 405 response should advertise the methods supported for that resource in the Allow header. This distinguishes a known resource with an unsupported method from a 404 response for an unknown target. Clients should correct the method according to the resource contract instead of changing the URI blindly.

RFC 9110: HTTP Semantics

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