Need help with lsquic?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

741 Stars 170 Forks Other 381 Commits 28 Opened issues


LiteSpeed QUIC and HTTP/3 Library

Services available


Need anything else?

Contributors list

Linux and MacOS build status Windows build status FreeBSD build status Documentation Status

LiteSpeed QUIC (LSQUIC) Library README


LiteSpeed QUIC (LSQUIC) Library is an open-source implementation of QUIC and HTTP/3 functionality for servers and clients. Most of the code in this distribution is used in our own products: LiteSpeed Web Server, LiteSpeed ADC, and OpenLiteSpeed.

Currently supported QUIC versions are v1 (disabled by default until the QUIC RFC is released); Internet-Draft versions 34, 29, and 27; and the older "Google" QUIC versions Q043, Q046, an Q050.


Documentation is available at

In addition, see example programs for API usage and EXAMPLES.txt for some compilation and run-time options.


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

  1. Clone BoringSSL by issuing the following command:
git clone
cd boringssl

You may need to install pre-requisites like zlib and libevent.

  1. Use specific BoringSSL version
git checkout a2278d4d2cabe73f6663e3299ea7808edfa306b9
  1. Compile the library
cmake . &&  make

Remember where BoringSSL sources are:


If you want to turn on optimizations, do

cmake -DCMAKE_BUILD_TYPE=Release . && make

If you want to build as a library, (necessary to build lsquic itself as as shared library) do:

cmake -DBUILD_SHARED_LIBS=1 . && make

Building LSQUIC Library


, 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
git submodule init
git submodule update
  1. Compile the library


# $BORINGSSL is the top-level BoringSSL directory from the previous step

As a dynamic library:

  1. Run tests
make test

Building with Docker

The library and the example client and server can be built with Docker.

Initialize Git submodules:

cd lsquic
git submodule init
git submodule update

Build the Docker image:

docker build -t lsquic .

Then you can use the examples from the command line. For example:

sudo docker run -it --rm lsquic http_client -s  -p / -o version=Q046
sudo docker run -p 12345:12345/udp -v /path/to/certs:/mnt/certs -it --rm lsquic http_server -c,/mnt/certs/chain,/mnt/certs/key


The library has been tested on the following platforms: - Linux - i386 - x8664 - ARM (Raspberry Pi 3) - FreeBSD - i386 - MacOS - x8664 - Android - ARM - Windows - x86_64

Get Involved

Do not hesitate to report bugs back to us. Even better, send us fixes and improvements!

Have fun,

LiteSpeed QUIC Team.

Copyright (c) 2017 - 2021 LiteSpeed Technologies Inc

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.