Add DERP generate_204 endpoint for captive portal detection. #1600
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When connecting to a DERP server the client makes a request to
/generate_204
endpoint with the headerX-Tailscale-Challenge
. In order to pass the captive portal test, the server must provider a 204 NoContent response withX-Tailscale-Response
set.The source for this simple endpoint was taken directly from Derper source at the time of commit