On Mon, Jul 11, 2016 at 10:39 PM, John R Levine <jo...@taugh.com> wrote: >> for a web to DNS proxy to decide to send a reply back, it would need to >> consider it complete? >> >> Or are you proposing that the http server would start streaming back the >> payload as it received the (possibly out of order) replies? > > > I was thinking that the proxy would get all the queries from the DNS > request, deal with them however it wants, maybe stuff them to a nearby DNS > cache with TCP if it pipelines properly, or split them up into separate > requests if it doesn't, then collect the responses and send them back when > it has them, which I guess would constitute streaming. RFC 7766 says that > out-of-order is fine.
Without HTTP/2 each request, clients would need to start a separate connection to get parallel processing, which means TCP handshake and potentially a TLS and more bookkeeping code. So client makes requests to proxy over HTTP/2 to mitigate the costs (here 7766 doesn't apply). Then proxy translates incoming HTTP/2 multiplexed requests into either DNS/TCP queries to origins (here 7766 helps) or plain old DNS (additional costs and bookkeeping). Server sends back DNS responses to proxy, which in turn translates them to DNS/HTTP answers. So both DNS/TCP out-of-order processing and DNS/HTTP out-of-order processing is desirable here. > I suppose with http/2 we get two-way streaming more or less for free. > > R's, > John Yep, the proxy can also push DNS answers to client ahead of time, which is interesting and something DNS servers can't do right now. On another note - this proposal kind of competes with DNS over HTTP encoded in JSON. While that one doesn't transport exact byte-by-byte DNS messages, it's much more consumer-friendly and elegant than piggybacking binary data. I wonder why that one is not getting more attention. Marek > > _______________________________________________ > DNSOP mailing list > DNSOP@ietf.org > https://www.ietf.org/mailman/listinfo/dnsop _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
