BaseHTTPServer.BaseHTTPRequestHandler.responses contains a mapping from 
HTTP status codes to the 2-ple (shortmessage, longmessage), based on RFC 
2616.

The 2-ple for 405 is ('Method Not Allowed','Specified method is invalid 
for this server.'),

RFC 405 says "An origin server SHOULD return the status code 405 (Method 
Not Allowed) if the method is known by the origin server but not allowed 
for the requested resource.

I think the message should be "Specified method is invalid for this 
resource". That is, change "server" to "resource".