501 / Not Implemented

“服务器不支持当前请求所需要的某个功能。当服务器无法识别请求的方法,并且无法支持其对任何资源的请求。“ — wikipedia

“The server does not support the functionality required to fulfill the request. This is the appropriate response when the server does not recognize the request method and is not capable of supporting it for any resource.“ — ietf

501 / code reference(s)
Rails HTTP Status Symbol
:not_implemented
← return