Experimental IETF-standard HTTP/3 support (known issue exists) (#2727)

* Begin WIP integration of HTTP/3 support

* http3: Set actual Handler, make fakeClosePacketConn type for UDP sockets

Also use latest quic-go for ALPN fix

* Manually keep track of and close HTTP/3 listeners

* Update quic-go after working through some http3 bugs

* Fix go mod

* Make http3 optional for now

1 files changed, 42 insertions, 2 deletions

diff --git a/go.sum b/go.sum
index 4c691a682..3a8481054 100644
--- a/go.sum
+++ b/go.sum
@@ -6,23 +6,36 @@ github.com/Masterminds/semver v1.4.2 h1:WBLTQ37jOCzSLtXNdoo8bNM8876KhNqOKvrlGITg
 github.com/Masterminds/semver v1.4.2/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
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@@ -34,6 +47,14 @@ github.com/klauspost/compress v1.7.1-0.20190613161414-0b31f265a57b/go.mod h1:RyI
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+github.com/lucas-clemente/quic-go v0.7.1-0.20190908032346-fc962d18373a/go.mod h1:iP3S21xvg0qlsEAz+goZ/qfptsfhshjzkbhEK6Ka3Fg=
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+github.com/marten-seemann/qpack v0.1.0/go.mod h1:LFt1NU/Ptjip0C2CPkhimBz5CGE3WGDAUWqna+CNTrI=
+github.com/marten-seemann/qtls v0.4.0 h1:HM9ftULNeuhGiCliIfPKvp5VDJw6pvi/Ghq6PYf7B0E=
+github.com/marten-seemann/qtls v0.4.0/go.mod h1:pxVXcHHw1pNIt8Qo0pwSYQEoZ8yYOOPXTCZLQQunvRc=
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 github.com/miekg/dns v1.1.3 h1:1g0r1IvskvgL8rR+AcHzUA+oFmGcQlaIm4IqakufeMM=
@@ -42,6 +63,11 @@ github.com/mitchellh/go-ps v0.0.0-20170309133038-4fdf99ab2936 h1:kw1v0NlnN+GZcU8
 github.com/mitchellh/go-ps v0.0.0-20170309133038-4fdf99ab2936/go.mod h1:r1VsdOzOPt1ZSrGZWFoNhsAedKnEd6r9Np1+5blZCWk=
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@@ -60,23 +86,37 @@ go.starlark.net v0.0.0-20190604130855-6ddc71c0ba77/go.mod h1:c1/X6cHgvdXj6pUlmWK
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