Semantics: 7.8 Upgrade

[wenbozhu]

Clarify if the request needs to be the 1st request after a connection is opened.

[reschke]

Is there a reason why you ask? Are there problems when it's not the 1st request?

[wtarreau]

I'm not aware of any such problem, and for example in haproxy we do support upgrades anywhere.

[wenbozhu]

Just a question I had .. which I feel the spec may want to call it out, either 1st request only or no such restriction.

[mnot]

Nothing in HTTP depends on where a request is placed upon a connection, because it's a stateless protocol. see last paragraph here (this is likely to move to connections soon, which is more appropriate.

Should we spell this out more clearly there?

[wtarreau]

Probably, it never hurts to remind it.

[wenbozhu]

I see the case for proxies to reuse and upgrade an existing connection to the server. Mentioning this will encourage correct server implementations.