Brad Fitzpatrick 53a2f63658 net/dns/resolver: race well-known resolvers less aggressively ... Instead of blasting away at all upstream resolvers at the same time, make a timing plan upon reconfiguration and have each upstream have an associated start delay, depending on the overall forwarding config. So now if you have two or four upstream Google or Cloudflare DNS servers (e.g. two IPv4 and two IPv6), we now usually only send a query, not four. This is especially nice on iOS where we start fewer DoH queries and thus fewer HTTP/1 requests (because we still disable HTTP/2 on iOS), fewer sockets, fewer goroutines, and fewer associated HTTP buffers, etc, saving overall memory burstiness. Fixes #2436 Updates tailscale/corp#2250 Updates tailscale/corp#2238 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>		2021-07-25 20:45:47 -07:00
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doh_test.go	net/dns/resolver: fall back to IPv6 for well-known DoH servers if v4 fails	2021-07-21 12:45:25 -07:00
forwarder.go	net/dns/resolver: race well-known resolvers less aggressively	2021-07-25 20:45:47 -07:00
macios_ext.go	net/dns{,/resolver}: refactor DNS forwarder, send out of right link on macOS/iOS	2021-06-23 16:04:10 -07:00
neterr_darwin.go	net/dns/resolver: permit larger max responses, signal truncation	2021-06-08 19:29:12 -04:00
neterr_other.go	net/dns/resolver: fmt item	2021-06-27 23:57:55 -07:00
neterr_windows.go	net/dns/resolver: permit larger max responses, signal truncation	2021-06-08 19:29:12 -04:00
tsdns_server_test.go	net/dns/resolver: clamp EDNS size	2021-06-25 08:56:34 -04:00
tsdns_test.go	net/dns/resolver: clamp EDNS size	2021-06-25 08:56:34 -04:00
tsdns.go	net/dns/resolver: race well-known resolvers less aggressively	2021-07-25 20:45:47 -07:00