feat(pool): add a Negotiate pooling service #228
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Creates a
Negotiate
type that uses an inner make-service, inspects the result, and then either returns an upgraded service, or fallback, depending on the negotiated. This is somewhat like aRouter
, but instead of routing on the request, it's routing on the response. It's an advanced form of anEither
. The original use case is that of a connector that can sends ALPN to a destination, and can either comeback with HTTP/2 negotiated, or fallback to HTTP/1.Closes hyperium/hyper#3955