ResponseHeaders for no route and all routes

[app2eds]

I have some response headers that must be added to all responses (mandated by our security policies).

Is it possible, through configuration, to add response headers when a matching route is not found?

Is it possible, through configuration, to add a specific response header to ALL matching routes without having to add the ResponseHeader to each individual route?

I can create middleware to do this for all responses but would prefer configuration if possible.

[Tratcher]

Is it possible, through configuration, to add a specific response header to ALL matching routes without having to add the ResponseHeader to each individual route?

This is not currently possible, that would have to be done via middleware. #164 is the closest proposal I've seen for this.

Is it possible, through configuration, to add response headers when a matching route is not found?

This should be possible in 2.0 with a wildcard route and either #1923 or #1893