Hi, Jeff King wrote:
> I agree that would be a lot more pleasant for adding protocol features. > But I just worry that the stateful protocols get a lot less efficient. > I'm having trouble coming up with an easy reproduction, but my > recollection is that http has some nasty corner cases, because each > round of "have" lines sent to the server has to summarize the previous > conversation. So you can get a case where the client's requests keep > getting bigger and bigger during the negotiation (and eventually getting > large enough to cause problems). That's not so much a corner case as just how negotiation works over http. We want to do better (e.g. see [1]) but that's a bigger change than the initial protocol v2. As Brandon explained it to me, we really do want to use stateless-rpc semantics by default, since that's just better for maintainability. Instead of having two protocols, one that is sane and one that struggles to hoist that into stateless-rpc, there would be one stateless baseline plus capabilities to make use of state. For example, it would be nice to have a capability to remember negotiation state between rounds, to get around exactly the problem you're describing when using a stateful protocol. Stateless backends would just not advertise such a capability. But doing that without [1] still sort of feels like a cop-out. If we can get a reasonable baseline using ideas like [1] and then have a capability to keep server-side state as icing on the cake instead of having a negotiation process that only really makes sense when you have server-side state, then that would be even better. > If anything, I wish we could push the http protocol in a more stateful > direction with something like websockets. But I suspect that's an > unrealistic dream, just because not everybody's http setup (proxies, > etc) will be able to handle that. Agreed. I think we have to continue to deal with stateless-rpc semantics, at least for the near future. Jonathan [1] https://public-inbox.org/git/20180227054638.gb65...@aiede.svl.corp.google.com/
