Details
Critical Description
cookie_authentication_handler does not throw if the cookie is invalid or has expired, instead it delegates to the next handler.
This leads to ugly results like getting a response from /_session but with no userCtx filled in.
cookie_authentication_handler should throw if, and only if, there's an AuthSession cookie that is expired or invalid. We shouldn't attempt to try other auth schemes. If there is no such cookie, then we delegate.