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Tom DNetto c8f4dfc8c0 derp/derphttp,net/netcheck: improve netcheck behavior under MITM proxies ... In cases where tailscale is operating behind a MITM proxy, we need to consider that a lot more of the internals of our HTTP requests are visible and may be used as part of authorization checks. As such, we need to 'behave' as closely as possible to ideal. - Some proxies do authorization or consistency checks based the on Host header or HTTP URI, instead of just the IP/hostname/SNI. As such, we need to construct a `*http.Request` with a valid URI everytime HTTP is going to be used on the wire, even if its over TLS. Aside from the singular instance in net/netcheck, I couldn't find anywhere else a http.Request was constructed incorrectly. - Some proxies may deny requests, typically by returning a 403 status code. We should not consider these requests as a valid latency check, so netcheck semantics have been updated to consider >299 status codes as a failed probe. Signed-off-by: Tom DNetto <tom@tailscale.com>		3 years ago
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derphttp	derp/derphttp,net/netcheck: improve netcheck behavior under MITM proxies	3 years ago
testdata	derp: add debug traffic handler	3 years ago
wsconn	cmd/derper, derp/derphttp: add websocket support	3 years ago
derp.go	derp: add new health update and server restarting frame types	3 years ago
derp_client.go	derp: add Client.LocalAddr method	3 years ago
derp_server.go	derp: add (*Server).IsClientConnectedForTest func. (#4331)	3 years ago
derp_test.go	derp: set Basic Constraints on metacert	3 years ago
dropreason_string.go	derp: accept dup clients without closing prior's connection	3 years ago