Build the 405 Method Not Allowed message used when either the request's HTTP method is
unrecognized or the resolved method isn't defined on the matched route. Shared between the
mock-host fetch wrapper and the host package's pre-handler so both paths surface the same
string.
Build the 405 Method Not Allowed message used when either the request's HTTP method is unrecognized or the resolved method isn't defined on the matched route. Shared between the mock-host fetch wrapper and the host package's pre-handler so both paths surface the same string.