Re: [quicwg/base-drafts] HTTP/QUIC without Alt-Svc? (#253)

[Mike Bishop <[e-mail]>]

By that logic, why can't you just try https:// for any http:// URL, or try https://host:443/ if connecting to https://host:8443/ fails?  An origin specifies a scheme, protocol, and port; scheme by definition bundles a transport protocol.  If you change any of those, you're talking to a different origin.  Alt-Svc provides a mechanism for an origin to bless a different endpoint as being co-authoritative for that origin, and that's what H3 does currently.  Lacking an Alt-Svc delegation, you're talking to a different origin.

Now, if we chose to go update the definition of the "http" and "https" schemes to specify either/both transport protocols, we could perhaps do so; while it stretches the spirit of RFC 3986, that doesn't *exactly* say that it can specify only one transport protocol.

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