Match a concrete HTTP request (method + URL) to zero-or-one operation (CONFORMANCE §B.3).
Recognition direction: reverse-parse the path, filter by method; concrete-over-variable is a runtime
tiebreak (fewest path variables wins). Returns null if no operation matches.
Match a concrete HTTP request (method + URL) to zero-or-one operation (CONFORMANCE §B.3). Recognition direction: reverse-parse the path, filter by method; concrete-over-variable is a runtime tiebreak (fewest path variables wins). Returns null if no operation matches.