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# HTTP3 (and QUIC)
## Resources
[HTTP/3 Explained](https://http3-explained.haxx.se/en/) - the online free
book describing the protocols involved.
[QUIC implementation](https://github.com/curl/curl/wiki/QUIC-implementation) -
the wiki page describing the plan for how to support QUIC and HTTP/3 in curl
and libcurl.
[quicwg.org](https://quicwg.org/) - home of the official protocol drafts
## QUIC libraries
QUIC libraries we are experimenting with:
[ngtcp2](https://github.com/ngtcp2/ngtcp2)
[quiche](https://github.com/cloudflare/quiche)
## Experimental
HTTP/3 and QUIC support in curl is considered **EXPERIMENTAL** until further
notice. It needs to be enabled at build-time.
Further development and tweaking of the HTTP/3 support in curl will happen in
in the master branch using pull-requests, just like ordinary changes.
# ngtcp2 version
## Build with OpenSSL
Build (patched) OpenSSL
% git clone --depth 1 -b openssl-3.0.0+quic https://github.com/quictls/openssl
% cd openssl
% ./config enable-tls1_3 --prefix=<somewhere1>
% make
% make install
Build nghttp3
% cd ..
% git clone https://github.com/ngtcp2/nghttp3
% cd nghttp3
% autoreconf -fi
% ./configure --prefix=<somewhere2> --enable-lib-only
% make
% make install
Build ngtcp2
% cd ..
% git clone https://github.com/ngtcp2/ngtcp2
% cd ngtcp2
% autoreconf -fi
% ./configure PKG_CONFIG_PATH=<somewhere1>/lib/pkgconfig:<somewhere2>/lib/pkgconfig LDFLAGS="-Wl,-rpath,<somewhere1>/lib" --prefix=<somewhere3> --enable-lib-only
% make
% make install
Build curl
% cd ..
% git clone https://github.com/curl/curl
% cd curl
% autoreconf -fi
% LDFLAGS="-Wl,-rpath,<somewhere1>/lib" ./configure --with-openssl=<somewhere1> --with-nghttp3=<somewhere2> --with-ngtcp2=<somewhere3>
% make
% make install
For OpenSSL 3.0.0 or later builds on Linux for x86_64 architecture, substitute all occurrences of "/lib" with "/lib64"
## Build with GnuTLS
Build GnuTLS
% git clone --depth 1 https://gitlab.com/gnutls/gnutls.git
% cd gnutls
% ./bootstrap
% ./configure --prefix=<somewhere1>
% make
% make install
Build nghttp3
% cd ..
% git clone https://github.com/ngtcp2/nghttp3
% cd nghttp3
% autoreconf -fi
% ./configure --prefix=<somewhere2> --enable-lib-only
% make
% make install
Build ngtcp2
% cd ..
% git clone https://github.com/ngtcp2/ngtcp2
% cd ngtcp2
% autoreconf -fi
% ./configure PKG_CONFIG_PATH=<somewhere1>/lib/pkgconfig:<somewhere2>/lib/pkgconfig LDFLAGS="-Wl,-rpath,<somewhere1>/lib" --prefix=<somewhere3> --enable-lib-only --with-gnutls
% make
% make install
Build curl
% cd ..
% git clone https://github.com/curl/curl
% cd curl
% autoreconf -fi
% ./configure --without-openssl --with-gnutls=<somewhere1> --with-nghttp3=<somewhere2> --with-ngtcp2=<somewhere3>
% make
% make install
# quiche version
## build
Build quiche and BoringSSL:
% git clone --recursive https://github.com/cloudflare/quiche
% cd quiche
% cargo build --package quiche --release --features ffi,pkg-config-meta,qlog
% mkdir quiche/deps/boringssl/src/lib
% ln -vnf $(find target/release -name libcrypto.a -o -name libssl.a) quiche/deps/boringssl/src/lib/
Build curl:
% cd ..
% git clone https://github.com/curl/curl
% cd curl
% autoreconf -fi
% ./configure LDFLAGS="-Wl,-rpath,$PWD/../quiche/target/release" --with-openssl=$PWD/../quiche/quiche/deps/boringssl/src --with-quiche=$PWD/../quiche/target/release
% make
% make install
If `make install` results in `Permission denied` error, you will need to prepend it with `sudo`.
# `--http3`
Use HTTP/3 directly:
curl --http3 https://nghttp2.org:4433/
Upgrade via Alt-Svc:
curl --alt-svc altsvc.cache https://quic.aiortc.org/
See this [list of public HTTP/3 servers](https://bagder.github.io/HTTP3-test/)
## Known Bugs
Check out the [list of known HTTP3 bugs](https://curl.se/docs/knownbugs.html#HTTP3).
# HTTP/3 Test server
This is not advice on how to run anything in production. This is for
development and experimenting.
## Preqreqs
An existing local HTTP/1.1 server that hosts files. Preferably also a few huge
ones. You can easily create huge local files like `truncate -s=8G 8GB` - they
are huge but do not occupy that much space on disk since they're just a big
hole.
In my Debian setup I just installed **apache2**. It runs on port 80 and has a
document root in `/var/www/html`. I can get the 8GB file from it with `curl
localhost/8GB -o dev/null`
In this description we setup and run a HTTP/3 reverse-proxy in front of the
HTTP/1 server.
## Setup
You can select either or both of these server solutions.
### nghttpx
Get, build and install **quictls**, **nghttp3** and **ngtcp2** as described
above.
Get, build and install **nghttp2**:
git clone https://github.com/nghttp2/nghttp2.git
cd nghttp2
autoreconf -fi
PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/home/daniel/build-quictls/lib/pkgconfig:/home/daniel/build-nghttp3/lib/pkgconfig:/home/daniel/build-ngtcp2/lib/pkgconfig LDFLAGS=-L/home/daniel/build-quictls/lib CFLAGS=-I/home/daniel/build-quictls/include ./configure --enable-maintainer-mode --prefix=/home/daniel/build-nghttp2 --disable-shared --enable-app --enable-http3 --without-jemalloc --without-libxml2 --without-systemd
make && make install
Run the local h3 server on port 9443, make it proxy all traffic through to
HTTP/1 on localhost port 80. For local toying, we can just use the test cert
that exists in curl's test dir.
CERT=$CURLSRC/tests/stunnel.pem
$HOME/bin/nghttpx $CERT $CERT --backend=localhost,80 \
--frontend="localhost,9443;quic"
### Caddy
[Install caddy](https://caddyserver.com/docs/install), you can even put the
single binary in a separate directory if you prefer.
In the same directory you put caddy, create a `Caddyfile` with the following
content to run a HTTP/3 reverse-proxy on port 7443:
~~~
{
auto_https disable_redirects
servers :7443 {
protocol {
experimental_http3
}
}
}
localhost:7443 {
reverse_proxy localhost:80
}
~~~
Then run caddy:
./caddy start
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