LiteSpeed QUIC Client Library
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LiteSpeed QUIC (LSQUIC) Client Library README


LiteSpeed QUIC (LSQUIC) Client Library is an open-source implementation of QUIC functionality for clients. It is released in the hope to speed the adoption of QUIC. Most of the code in this distribution is used in our own products: LiteSpeed Web Server and ADC. We think it is free of major problems. Nevertheless, do not hesitate to report bugs back to us. Even better, send us fixes and improvements!

Currently supported QUIC versions are Q035, Q039, Q043, and Q044. Support for newer versions will be added soon after they are released. The version(s) specified by IETF QUIC WG will be added once the IETF version of the protocol settles down a little.


The documentation for this module is admittedly sparse. The API is documented in include/lsquic.h. If you have doxygen, you can run doxygen dox.cfg or make docs. The example program is test/http_client.c: a bare-bones, but working, QUIC client. Have a look in EXAMPLES.txt to see how it can be used.


To build LSQUIC, you need CMake, zlib, and BoringSSL. The example program uses libevent to provide the event loop.

Building BoringSSL

BoringSSL is not packaged; you have to build it yourself. The process is straightforward. You will need go installed.

  1. Clone BoringSSL by issuing the following command:
git clone
cd boringssl
  1. Check out stable branch:
git checkout chromium-stable
  1. Compile the library
cmake . &&  make

If you want to turn on optimizations, do

cmake -DCMAKE_BUILD_TYPE=Release . && make
  1. Install the library

This is the manual step. You will need to copy library files manually. LSQUIC client library needs two: ssl/libssl.a and crypto/libcrypto.a. To install these in /usr/local/lib, you should do the following:

cd /usr/local/lib
sudo cp $BORINGSSL_SOURCE/ssl/libssl.a .
sudo cp $BORINGSSL_SOURCE/crypto/libcrypto.a .

If you do not want to install the library (or do not have root), you can do this instead:

mkdir -p $HOME/tmp/boringssl-libs
cd $HOME/tmp/boringssl-libs
ln -s $BORINGSSL_SOURCE/ssl/libssl.a
ln -s $BORINGSSL_SOURCE/crypto/libcrypto.a

Building LSQUIC Client Library

LSQUIC's http_client and the tests link BoringSSL libraries statically. Following previous section, you can build LSQUIC as follows:

  1. Get the source code
git clone
cd lsquic-client
  1. Compile the library
                                -DBORINGSSL_LIB=$HOME/tmp/boringssl-libs .
  1. Run tests
make test

Building with Docker

The library and http_client example can be built with Docker.

docker build -t lsquic-client .

Then you can use the http_client example from the command line.

docker run -it --rm lsquic-client http_client -H -s -p /


The client library has been tested on the following platforms:

  • Linux
    • i386
    • x86_64
    • ARM (Raspberry Pi 3)
  • FreeBSD
    • i386
  • Windows
    • x86_64
  • MacOS
    • x86_64

Have fun,

LiteSpeed QUIC Team.

Copyright (c) 2017 - 2018 LiteSpeed Technologies Inc