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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 with OpenSSL
Build (patched) OpenSSL
% git clone --depth 1 -b OpenSSL_1_1_1g-quic-draft-29 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> --enable-lib-only
% 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>
% make
## Build with GnuTLS
Build GnuTLS
% git clone --depth 1 https://gitlab.com/gnutls/gnutls.git
% cd gnutls
% ./bootstrap
% ./configure --disable-doc --prefix=<somewhere1>
% make
% make install
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> --enable-lib-only
% make
% make install
Build curl
% cd ..
% git clone https://github.com/curl/curl
% cd curl
% ./buildconf
% ./configure --without-ssl --with-gnutls=<somewhere1> --with-nghttp3=<somewhere2> --with-ngtcp2=<somewhere3>
% make
# quiche version
## build
Build quiche and BoringSSL:
% git clone --recursive https://github.com/cloudflare/quiche
% cd quiche
% cargo build --release --features pkg-config-meta,qlog
% mkdir deps/boringssl/src/lib
% ln -vnf $(find target/release -name libcrypto.a -o -name libssl.a) deps/boringssl/src/lib/
Build curl:
% cd ..
% git clone https://github.com/curl/curl
% cd curl
% ./buildconf
% ./configure LDFLAGS="-Wl,-rpath,$PWD/../quiche/target/release" --with-ssl=$PWD/../quiche/deps/boringssl/src --with-quiche=$PWD/../quiche/target/release
% 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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