# A QUIC implementation in pure Go

<img src="docs/quic.png" width=303 height=124>

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quic-go is an implementation of the [QUIC](https://en.wikipedia.org/wiki/QUIC) protocol in Go. It implements the [IETF QUIC draft-29](https://tools.ietf.org/html/draft-ietf-quic-transport-29), [draft-32](https://tools.ietf.org/html/draft-ietf-quic-transport-32) and [draft-34](https://tools.ietf.org/html/draft-ietf-quic-transport-34).

## Version compatibility

Since quic-go is under active development, there's no guarantee that two builds of different commits are interoperable. The QUIC version used in the *master* branch is just a placeholder, and should not be considered stable.

When using quic-go as a library, please always use a [tagged release](https://github.com/lucas-clemente/quic-go/releases). Only these releases use the official draft version numbers.

## Guides

*We currently support Go 1.15+, with [Go modules](https://github.com/golang/go/wiki/Modules) support enabled.*

Running tests:

    go test ./...

### QUIC without HTTP/3

Take a look at [this echo example](example/echo/echo.go).

## Usage

### As a server

See the [example server](example/main.go). Starting a QUIC server is very similar to the standard lib http in go:

```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](example/client/main.go). Use a `http3.RoundTripper` as a `Transport` in a `http.Client`.

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

## 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](https://github.com/lucas-clemente/quic-go/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22). If you have any questions, please feel free to reach out by opening an issue or leaving a comment.