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026840e35c
curl/docs/HTTP3.md
Daniel Stenberg 026840e35c
CURLOPT_HTTP_VERSION: seting this to 3 forces HTTP/3 use directly 
Even though it cannot fall-back to a lower HTTP version automatically. The
safer way to upgrade remains via CURLOPT_ALTSVC.

CURLOPT_H3 no longer has any bits that do anything and might be removed
before we remove the experimental label.

Updated the curl tool accordingly to use "--http3".

Closes #4197
2019-08-08 08:17:24 +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 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 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 https://cloudflare-quic.com/
 % src/curl --http3 https://facebook.com/
 % src/curl --http3 https://quic.aiortc.org:4433/
 % src/curl --http3 https://quic.rocks:4433/