4×× CLIENT ERROR
405 METHOD NOT ALLOWED
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.
Calculating Heuristic Freshness RFC7234 Section 4.2.2
405 METHOD NOT ALLOWED Source: RFC7231 Section 6.5.5
405 CODE REFERENCES
Rails HTTP Status Symbol
Go HTTP Status Constant
Symfony HTTP Status Constant
Python2 HTTP Status Constant
Python3+ HTTP Status Constant
Python3.5+ HTTP Status Constant