Tries the supplied routes in sequence, returning the result of the first route that doesn't reject the request.
Tries the supplied routes in sequence, returning the result of the first route that doesn't reject the request. This is an alternative to direct usage of the infix ~ operator. The ~ can be prone to programmer error, because if it is omitted, the program will still be syntactically correct, but will not actually attempt to match multiple routes, as intended.
subroutes to concatenate
the concatenated route