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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 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
Build (patched) OpenSSL
% git clone --depth 1 -b OpenSSL_1_1_1d-quic-draft-27 https://github.com/tatsuhiro-t/openssl
% cd openssl
% ./config enable-tls1_3 --prefix=<somewhere1>
% make
% make install_sw
Build nghttp3
% cd ..
% git clone https://github.com/ngtcp2/nghttp3
% cd nghttp3
% autoreconf -i
% ./configure --prefix=<somewhere2> --enable-lib-only
% make
% make install
Build ngtcp2
% cd ..
% git clone https://github.com/ngtcp2/ngtcp2
% cd ngtcp2
% autoreconf -i
% ./configure PKG_CONFIG_PATH=<somewhere1>/lib/pkgconfig:<somewhere2>/lib/pkgconfig LDFLAGS="-Wl,-rpath,<somewhere1>/lib" --prefix=<somewhere3>
% make
% make install
Build curl
% cd ..
% git clone https://github.com/curl/curl
% cd curl
% ./buildconf
% LDFLAGS="-Wl,-rpath,<somewhere1>/lib" ./configure --with-ssl=<somewhere1> --with-nghttp3=<somewhere2> --with-ngtcp2=<somewhere3> --enable-alt-svc
% make
# quiche version
## build
Clone quiche and BoringSSL:
% git clone --recursive https://github.com/cloudflare/quiche
Build BoringSSL (it needs to be built manually so it can be reused with curl):
% cd quiche/deps/boringssl
% mkdir build
% cd build
% cmake -DCMAKE_POSITION_INDEPENDENT_CODE=on ..
% make
% cd ..
% mkdir -p .openssl/lib
% 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 --features pkg-config-meta
Build curl:
% cd ..
% git clone https://github.com/curl/curl
% cd curl
% ./buildconf
% ./configure LDFLAGS="-Wl,-rpath,$PWD/../quiche/target/release" --with-ssl=$PWD/../quiche/deps/boringssl/.openssl --with-quiche=$PWD/../quiche/target/release --enable-alt-svc
% make
## Run
Use HTTP/3 directly:
curl --http3 https://nghttp2.org:8443/
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/)
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