374 lines
12 KiB
Markdown
374 lines
12 KiB
Markdown
# HTTP3 (and QUIC)
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## Resources
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[HTTP/3 Explained](https://http3-explained.haxx.se/en/) - the online free
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book describing the protocols involved.
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[quicwg.org](https://quicwg.org/) - home of the official protocol drafts
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## QUIC libraries
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QUIC libraries we are experimenting with:
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[ngtcp2](https://github.com/ngtcp2/ngtcp2)
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[quiche](https://github.com/cloudflare/quiche)
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[msh3](https://github.com/nibanks/msh3) (with [msquic](https://github.com/microsoft/msquic))
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## Experimental
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HTTP/3 and QUIC support in curl is considered **EXPERIMENTAL** until further
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notice. It needs to be enabled at build-time.
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Further development and tweaking of the HTTP/3 support in curl will happen in
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the master branch using pull-requests, just like ordinary changes.
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To fix before we remove the experimental label:
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- the used QUIC library needs to consider itself non-beta
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- it's fine to "leave" individual backends as experimental if necessary
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# ngtcp2 version
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Building curl with ngtcp2 involves 3 components: `ngtcp2` itself, `nghttp3` and a QUIC supporting TLS library. The supported TLS libraries are covered below.
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For now, `ngtcp2` and `nghttp3` are still *experimental* which means their evolution bring breaking changes. Therefore, the proper version of both libraries need to be used when building curl. These are
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* `ngtcp2`: v0.19.1
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* `nghttp3`: v0.15.0
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## Build with OpenSSL
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Build (patched) OpenSSL
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% git clone --depth 1 -b openssl-3.0.10+quic https://github.com/quictls/openssl
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% cd openssl
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% ./config enable-tls1_3 --prefix=<somewhere1>
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% make
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% make install
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Build nghttp3
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% cd ..
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% git clone -b v0.15.0 https://github.com/ngtcp2/nghttp3
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% cd nghttp3
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% autoreconf -fi
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% ./configure --prefix=<somewhere2> --enable-lib-only
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% make
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% make install
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Build ngtcp2
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% cd ..
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% git clone -b v0.19.1 https://github.com/ngtcp2/ngtcp2
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% cd ngtcp2
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% autoreconf -fi
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% ./configure PKG_CONFIG_PATH=<somewhere1>/lib/pkgconfig:<somewhere2>/lib/pkgconfig LDFLAGS="-Wl,-rpath,<somewhere1>/lib" --prefix=<somewhere3> --enable-lib-only
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% make
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% make install
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Build curl
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% cd ..
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% git clone https://github.com/curl/curl
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% cd curl
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% autoreconf -fi
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% LDFLAGS="-Wl,-rpath,<somewhere1>/lib" ./configure --with-openssl=<somewhere1> --with-nghttp3=<somewhere2> --with-ngtcp2=<somewhere3>
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% make
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% make install
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For OpenSSL 3.0.0 or later builds on Linux for x86_64 architecture, substitute all occurrences of "/lib" with "/lib64"
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## Build with GnuTLS
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Build GnuTLS
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% git clone --depth 1 https://gitlab.com/gnutls/gnutls.git
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% cd gnutls
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% ./bootstrap
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% ./configure --prefix=<somewhere1>
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% make
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% make install
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Build nghttp3
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% cd ..
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% git clone -b v0.15.0 https://github.com/ngtcp2/nghttp3
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% cd nghttp3
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% autoreconf -fi
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% ./configure --prefix=<somewhere2> --enable-lib-only
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% make
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% make install
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Build ngtcp2
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% cd ..
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% git clone -b v0.19.1 https://github.com/ngtcp2/ngtcp2
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% cd ngtcp2
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% autoreconf -fi
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% ./configure PKG_CONFIG_PATH=<somewhere1>/lib/pkgconfig:<somewhere2>/lib/pkgconfig LDFLAGS="-Wl,-rpath,<somewhere1>/lib" --prefix=<somewhere3> --enable-lib-only --with-gnutls
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% make
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% make install
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Build curl
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% cd ..
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% git clone https://github.com/curl/curl
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% cd curl
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% autoreconf -fi
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% ./configure --with-gnutls=<somewhere1> --with-nghttp3=<somewhere2> --with-ngtcp2=<somewhere3>
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% make
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% make install
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## Build with wolfSSL
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Build wolfSSL
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% git clone https://github.com/wolfSSL/wolfssl.git
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% cd wolfssl
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% autoreconf -fi
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% ./configure --prefix=<somewhere1> --enable-quic --enable-session-ticket --enable-earlydata --enable-psk --enable-harden --enable-altcertchains
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% make
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% make install
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Build nghttp3
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% cd ..
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% git clone -b v0.15.0 https://github.com/ngtcp2/nghttp3
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% cd nghttp3
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% autoreconf -fi
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% ./configure --prefix=<somewhere2> --enable-lib-only
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% make
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% make install
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Build ngtcp2
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% cd ..
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% git clone -b v0.19.1 https://github.com/ngtcp2/ngtcp2
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% cd ngtcp2
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% autoreconf -fi
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% ./configure PKG_CONFIG_PATH=<somewhere1>/lib/pkgconfig:<somewhere2>/lib/pkgconfig LDFLAGS="-Wl,-rpath,<somewhere1>/lib" --prefix=<somewhere3> --enable-lib-only --with-wolfssl
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% make
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% make install
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Build curl
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% cd ..
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% git clone https://github.com/curl/curl
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% cd curl
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% autoreconf -fi
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% ./configure --with-wolfssl=<somewhere1> --with-nghttp3=<somewhere2> --with-ngtcp2=<somewhere3>
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% make
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% make install
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# quiche version
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Since the quiche build manages its dependencies, curl can be built against the latest version. You are *probably* able to build against their main branch, but in case of problems, we recommend their latest release tag.
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## build
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Build quiche and BoringSSL:
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% git clone --recursive https://github.com/cloudflare/quiche
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% cd quiche
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% cargo build --package quiche --release --features ffi,pkg-config-meta,qlog
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% mkdir quiche/deps/boringssl/src/lib
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% ln -vnf $(find target/release -name libcrypto.a -o -name libssl.a) quiche/deps/boringssl/src/lib/
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Build curl:
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% cd ..
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% git clone https://github.com/curl/curl
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% cd curl
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% autoreconf -fi
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% ./configure LDFLAGS="-Wl,-rpath,$PWD/../quiche/target/release" --with-openssl=$PWD/../quiche/quiche/deps/boringssl/src --with-quiche=$PWD/../quiche/target/release
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% make
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% make install
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If `make install` results in `Permission denied` error, you will need to prepend it with `sudo`.
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# msh3 (msquic) version
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**Note**: The msquic HTTP/3 backend is immature and is not properly functional
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one as of September 2023. Feel free to help us test it and improve it, but
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there is no point in filing bugs about it just yet.
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## Build Linux (with quictls fork of OpenSSL)
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Build msh3:
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% git clone -b v0.6.0 --depth 1 --recursive https://github.com/nibanks/msh3
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% cd msh3 && mkdir build && cd build
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% cmake -G 'Unix Makefiles' -DCMAKE_BUILD_TYPE=RelWithDebInfo ..
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% cmake --build .
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% cmake --install .
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Build curl:
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% git clone https://github.com/curl/curl
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% cd curl
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% autoreconf -fi
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% ./configure LDFLAGS="-Wl,-rpath,/usr/local/lib" --with-msh3=/usr/local --with-openssl
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% make
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% make install
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Run from `/usr/local/bin/curl`.
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## Build Windows
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Build msh3:
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% git clone -b v0.6.0 --depth 1 --recursive https://github.com/nibanks/msh3
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% cd msh3 && mkdir build && cd build
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% cmake -G 'Visual Studio 17 2022' -DCMAKE_BUILD_TYPE=RelWithDebInfo ..
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% cmake --build . --config Release
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% cmake --install . --config Release
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**Note** - On Windows, Schannel will be used for TLS support by default. If
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you with to use (the quictls fork of) OpenSSL, specify the
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`-DQUIC_TLS=openssl` option to the generate command above. Also note that
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OpenSSL brings with it an additional set of build dependencies not specified
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here.
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Build curl (in [Visual Studio Command
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prompt](../winbuild/README.md#open-a-command-prompt)):
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% git clone https://github.com/curl/curl
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% cd curl/winbuild
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% nmake /f Makefile.vc mode=dll WITH_MSH3=dll MSH3_PATH="C:/Program Files/msh3" MACHINE=x64
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**Note** - If you encounter a build error with `tool_hugehelp.c` being
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missing, rename `tool_hugehelp.c.cvs` in the same directory to
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`tool_hugehelp.c` and then run `nmake` again.
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Run in the `C:/Program Files/msh3/lib` directory, copy `curl.exe` to that
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directory, or copy `msquic.dll` and `msh3.dll` from that directory to the
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`curl.exe` directory. For example:
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% C:\Program Files\msh3\lib> F:\curl\builds\libcurl-vc-x64-release-dll-ipv6-sspi-schannel-msh3\bin\curl.exe --http3 https://curl.se/
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# `--http3`
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Use only HTTP/3:
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curl --http3-only https://example.org:4433/
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Use HTTP/3 with fallback to HTTP/2 or HTTP/1.1 (see "HTTPS eyeballing" below):
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curl --http3 https://example.org:4433/
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Upgrade via Alt-Svc:
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curl --alt-svc altsvc.cache https://curl.se/
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See this [list of public HTTP/3 servers](https://bagder.github.io/HTTP3-test/)
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### HTTPS eyeballing
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With option `--http3` curl will attempt earlier HTTP versions as well should
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the connect attempt via HTTP/3 not succeed "fast enough". This strategy is
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similar to IPv4/6 happy eyeballing where the alternate address family is used
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in parallel after a short delay.
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The IPv4/6 eyeballing has a default of 200ms and you may override that via
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`--happy-eyeballs-timeout-ms value`. Since HTTP/3 is still relatively new, we
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decided to use this timeout also for the HTTP eyeballing - with a slight
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twist.
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The `happy-eyeballs-timeout-ms` value is the **hard** timeout, meaning after
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that time expired, a TLS connection is opened in addition to negotiate HTTP/2
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or HTTP/1.1. At half of that value - currently - is the **soft** timeout. The
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soft timeout fires, when there has been **no data at all** seen from the
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server on the HTTP/3 connection.
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So, without you specifying anything, the hard timeout is 200ms and the soft is 100ms:
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* Ideally, the whole QUIC handshake happens and curl has an HTTP/3 connection
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in less than 100ms.
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* When QUIC is not supported (or UDP does not work for this network path), no
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reply is seen and the HTTP/2 TLS+TCP connection starts 100ms later.
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* In the worst case, UDP replies start before 100ms, but drag on. This will
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start the TLS+TCP connection after 200ms.
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* When the QUIC handshake fails, the TLS+TCP connection is attempted right
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away. For example, when the QUIC server presents the wrong certificate.
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The whole transfer only fails, when **both** QUIC and TLS+TCP fail to
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handshake or time out.
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Note that all this happens in addition to IP version happy eyeballing. If the
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name resolution for the server gives more than one IP address, curl will try
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all those until one succeeds - just as with all other protocols. And if those
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IP addresses contain both IPv6 and IPv4, those attempts will happen, delayed,
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in parallel (the actual eyeballing).
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## Known Bugs
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Check out the [list of known HTTP3 bugs](https://curl.se/docs/knownbugs.html#HTTP3).
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# HTTP/3 Test server
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This is not advice on how to run anything in production. This is for
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development and experimenting.
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## Prerequisite(s)
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An existing local HTTP/1.1 server that hosts files. Preferably also a few huge
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ones. You can easily create huge local files like `truncate -s=8G 8GB` - they
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are huge but do not occupy that much space on disk since they are just big
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holes.
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In a Debian setup you can install **apache2**. It runs on port 80 and has a
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document root in `/var/www/html`. Download the 8GB file from apache with `curl
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localhost/8GB -o dev/null`
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In this description we setup and run an HTTP/3 reverse-proxy in front of the
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HTTP/1 server.
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## Setup
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You can select either or both of these server solutions.
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### nghttpx
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Get, build and install **quictls**, **nghttp3** and **ngtcp2** as described
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above.
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Get, build and install **nghttp2**:
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git clone https://github.com/nghttp2/nghttp2.git
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cd nghttp2
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autoreconf -fi
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PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/home/daniel/build-quictls/lib/pkgconfig:/home/daniel/build-nghttp3/lib/pkgconfig:/home/daniel/build-ngtcp2/lib/pkgconfig LDFLAGS=-L/home/daniel/build-quictls/lib CFLAGS=-I/home/daniel/build-quictls/include ./configure --enable-maintainer-mode --prefix=/home/daniel/build-nghttp2 --disable-shared --enable-app --enable-http3 --without-jemalloc --without-libxml2 --without-systemd
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make && make install
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Run the local h3 server on port 9443, make it proxy all traffic through to
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HTTP/1 on localhost port 80. For local toying, we can just use the test cert
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that exists in curl's test dir.
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CERT=$CURLSRC/tests/stunnel.pem
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$HOME/bin/nghttpx $CERT $CERT --backend=localhost,80 \
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--frontend="localhost,9443;quic"
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### Caddy
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[Install Caddy](https://caddyserver.com/docs/install). For easiest use, the binary
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should be either in your PATH or your current directory.
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Create a `Caddyfile` with the following content:
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~~~
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localhost:7443 {
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respond "Hello, world! you are using {http.request.proto}"
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}
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~~~
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Then run Caddy:
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./caddy start
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Making requests to `https://localhost:7443` should tell you which protocol is being used.
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You can change the hard-coded response to something more useful by replacing `respond`
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with `reverse_proxy` or `file_server`, for example: `reverse_proxy localhost:80`
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