Rachel Chen fd2c345152 sendQueue: ignore "datagram too large" error (#3328)
This commit introduces additional platform-dependent checking when the
kernel returns an error. Previously, the session is terminated when
PingFrame sends a discovery packet larger than the limit. With this
commit, the error is checked, and if it is "datagram too large", the
error is ignored.

Additionally,
1. This commit re-enables MTU discovery on Windows unless it
is disabled explicitly by user (Undo #3276),
2. Set IP_DONTFRAGMENT and IPV6_DONTFRAG with error checking on Windows,
   and
3. Set IP_MTU_DISCOVERY to PMTUDISC_DO for both IPv4 and IPv6 on Linux
   so that the kernel will return "message too long".

Fixes #3273 #3327
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A QUIC implementation in pure Go

PkgGoDev Code Coverage

quic-go is an implementation of the QUIC protocol, RFC 9000 protocol in Go. In addition to RFC 9000, it currently implements the IETF QUIC draft-29. Support for draft-29 will eventually be dropped, as it is phased out of the ecosystem.

Guides

We currently support Go 1.16.x and Go 1.17.x.

Running tests:

go test ./...

QUIC without HTTP/3

Take a look at this echo example.

Usage

As a server

See the example server. Starting a QUIC server is very similar to the standard lib http in go:

http.Handle("/", http.FileServer(http.Dir(wwwDir)))
http3.ListenAndServeQUIC("localhost:4242", "/path/to/cert/chain.pem", "/path/to/privkey.pem", nil)

As a client

See the example client. Use a http3.RoundTripper as a Transport in a http.Client.

http.Client{
  Transport: &http3.RoundTripper{},
}

Projects using quic-go

Project Description Stars
algernon Small self-contained pure-Go web server with Lua, Markdown, HTTP/2, QUIC, Redis and PostgreSQL support GitHub Repo stars
caddy Fast, multi-platform web server with automatic HTTPS GitHub Repo stars
go-ipfs IPFS implementation in go GitHub Repo stars
nextdns NextDNS CLI client (DoH Proxy) GitHub Repo stars
syncthing Open Source Continuous File Synchronization GitHub Repo stars
traefik The Cloud Native Application Proxy GitHub Repo stars
v2ray-core A platform for building proxies to bypass network restrictions GitHub Repo stars
cloudflared A tunneling daemon that proxies traffic from the Cloudflare network to your origins GitHub Repo stars
OONI Probe The Open Observatory of Network Interference (OONI) aims to empower decentralized efforts in documenting Internet censorship around the world. GitHub Repo stars

Contributing

We are always happy to welcome new contributors! We have a number of self-contained issues that are suitable for first-time contributors, they are tagged with help wanted. If you have any questions, please feel free to reach out by opening an issue or leaving a comment.

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