Adds Application.Responder helper for configuring which Responder the application will use. This works similarly to Application.Sessions (fixes #2181, #2185).
The application can be configured to use the default responder or a custom one.
app.responder.use(.default)
app.responder.use(.foo)
// or
app.responder.use { app in
FooResponder(routes: app.routes)
}Leading dot-syntax can be achieved by extending Application.Responder.Provider.
Vapor exposes .default and app.responder.default which return a DefaultResponder.
To create a responder, use current:
app.responder.current.respond(to: ...)Application.Responder conforms to Responder for backward compatibility. This creates a new instance of the responder for each call, so storing app.responder.current should be used where performance is important.
app.responder.respond(to: ...)