httpstatuses/contents/codes/405.md

set	code	title	references
4	405	Method Not Allowed	Rails HTTP Status Symbol :method_not_allowed

The 405 (Method Not Allowed) status code indicates that the method received in the request-line is known by the origin server but not supported by the target resource. The origin server MUST generate an Allow header field in a 405 response containing a list of the target resource's currently supported methods.

A 405 response is cacheable by default; i.e., unless otherwise indicated by the method definition or explicit cache controls (see Section 4.2.2 of RFC7234).

Source: RFC7231 Section 6.5.5