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curl/docs/HTTP3.md

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# HTTP3 (and QUIC)
## Resources
[HTTP/3 Explained](https://daniel.haxx.se/http3-explained/) - 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're experiementing 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
1. clone ngtcp2 from git (the draft-22 branch)
2. build and install ngtcp2's custom OpenSSL version (the quic-draft-22 branch)
3. build and install nghttp3
4. build and install ngtcp2 according to its instructions
5. configure curl with ngtcp2 support: `./configure --with-ngtcp2=<install prefix>`
6. build curl "normally"
## Running
Make sure the custom OpenSSL library is the one used at run-time, as otherwise
you'll just get ld.so linker errors.
## Invoke from command line
curl --http3-direct https://nghttp2.org:8443/
# quiche version
## build
Build BoringSSL (it needs to be built manually so it can be reused with curl):
% mkdir -p quiche/deps/boringssl/build
% cd quiche/deps/boringssl/build
% cmake -DCMAKE_POSITION_INDEPENDENT_CODE=on ..
% make -j`nproc`
% cd ..
% mkdir .openssl/lib -p
% cp build/crypto/libcrypto.a build/ssl/libssl.a .openssl/lib
% ln -s $PWD/include .openssl
Build quiche:
% cd ../..
% QUICHE_BSSL_PATH=$PWD/deps/boringssl cargo build --release
Clone and build curl:
% cd ..
% git clone https://github.com/curl/curl
% ./buildconf
% ./configure --with-ssl=$PWD/../quiche/deps/boringssl/.openssl --with-quiche=$PWD/../quiche --enable-debug
% make -j`nproc`
## Running
Make an HTTP/3 request.
% src/curl --http3-direct https://cloudflare-quic.com/
% src/curl --http3-direct https://facebook.com/
% src/curl --http3-direct https://quic.aiortc.org:4433/
% src/curl --http3-direct https://quic.rocks:4433/