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>		2022-04-19 12:47:57 -07:00
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netcheck_test.go	all: use any instead of interface{}	2022-03-17 11:35:09 -07:00
netcheck.go	derp/derphttp,net/netcheck: improve netcheck behavior under MITM proxies	2022-04-19 12:47:57 -07:00