By default, the proxy handles all requested routes on the given context(s), even if they are 404. This makes sense for routes that are actually handled by the target but there is a use case where it would be useful to be able to fall-through to the middleware chain if the target cannot handle the request. This would allow, for example, for a server’s functionality to be extended by another server.

This merge request adds afallthrough option. When present, any 404 errors fall through to the middleware stack of the server by callingnext().

Context:#248