Spring Add constant for 'Alt-Svc' to org.springframework.http.HttpHeaders

Please add a constant for Alt-Svc to org.springframework.http.HttpHeaders.

This is useful for HTTP/3 endpoint advertisement.

Maybe useful for Spring Cloud Gateway as well.

Comment From: bclozel

Thanks for the proposal, but we try to only add specific methods/attributes only for headers that Spring Framework ships support for. We are trying to keep the numbers of statics down in the HttpHeaders class. This header can still be supported out of the box with generic methods.