[comex]

> And I doubt people are thinking of carrying over comments in headers and line folding...

Heh, I don't think any reasonable web apps actually depend on the value of those :)

> What actually is the proposal to eliminate cookies? Just provide some fixed "identifier" type field?

Unfortunately, I don't think there is a concrete proposal to compare to, other than

    Given how almost universal the "session" concept on the Internet we
    should add it to the HTTP/2.0 standard, and make it available for
    HTTP routers to use as a "flow-label" for routing.