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curl/docs/HTTP3.md
Daniel Stenberg 3af0e76d1e
HTTP3: initial (experimental) support 
USe configure --with-ngtcp2 or --with-quiche

Using either option will enable a HTTP3 build.
Co-authored-by: Alessandro Ghedini <alessandro@ghedini.me>

Closes #3500
2019-07-21 23:49:03 +02:00

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HTTP3 (and QUIC)

Resources

HTTP/3 Explained - the online free book describing the protocols involved.

QUIC implementation - the wiki page describing the plan for how to support QUIC and HTTP/3 in curl and libcurl.

quicwg.org - home of the official protocol drafts

QUIC libraries

QUIC libraries we're experiementing with:

ngtcp2

quiche

Experimental!

HTTP/3 and QUIC support in curl is not yet working and this is early days. Consider all QUIC and HTTP/3 code to be EXPERIMENTAL until further notice.

curl does not have HTTP/3 support (yet).

The bleeding edge QUIC work is done in the dedicated QUIC branch, but the plan is to merge as often as possible from there to master. All QUIC related code will remain being build-time conditionally enabled.

ngtcp2 version

Build

  1. clone ngtcp2 from git (the draft-17 branch)
  2. build and install ngtcp2's custom OpenSSL version (the quic-draft-17 branch)
  3. build and install ngtcp2 according to its instructions
  4. configure curl with ngtcp2 support: ./configure --with-ngtcp2=<install prefix>
  5. 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/1.1 request to a QUIC server:

 % src/curl --http3-direct https://cloudflare-quic.com/