# litespeedtech/lsquic

LiteSpeed QUIC and HTTP/3 Library

Repository: https://github.com/litespeedtech/lsquic
Canonical: https://ross.abutalabs.com/products/lsquic
Language: C
License: MIT
License Family: permissive
Topics: quic, gquic, protocol, ietf, tls13, udp, http3, h3
Last push: 2026-08-02T02:31:13+00:00

## Health v2 (maintenance only)
Score: 96/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 95, release rhythm 95, longevity 100
- inputs: {"age_days": 3267, "days_push": 32, "days_rel": 32, "gap_med": 14.0, "n_releases_24m": 23}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1866, forks 393 (observed 2026-08-28T04:05:46.305163+00:00)

## What it is
LSQUIC is an open-source C library implementing the QUIC transport protocol and HTTP/3 for both servers and clients, used in production by LiteSpeed web server products. It supports QUIC v1/v2, RFC 9000-9002, RFC 9114 (HTTP/3), QPACK, and extensions like WebTransport and unreliable datagrams.

## Use cases
- add HTTP/3 support to a C or C++ server
- build a custom QUIC client in C
- implement WebTransport over HTTP/3
- test QUIC protocol compliance and interoperability
- embed QUIC transport in an existing network application
- serve HTTP/3 with QPACK compression

## When to choose
- you need a mature, production-proven QUIC/HTTP-3 implementation in C
- you want broad RFC coverage including QUIC v2 and WebTransport
- you are building a high-performance server or client on Linux, macOS, Windows, or FreeBSD

## When to avoid
- you want a higher-level language binding rather than a C API
- you prefer a pure userspace Rust or Go QUIC stack for memory safety
- you only need HTTP/2 or TCP-based transport

## Facets
- artifact type: library
- maturity: active
- function: http-server, http-client, networking, security
- domain: networking, web-development, developer-tools, performance
- platform: windows, bsd, cpp, c
- tags: quic, http3, tls13, udp-transport, webtransport, rfc-compliance, c-library, linux, macos

## Member repositories
- litespeedtech/lsquic (main) score 96

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:46.305163+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:15:32.463084+00:00, confidence not recorded.
  - readme: https://github.com/litespeedtech/lsquic (fetched 2026-08-28T04:05:46.305163+00:00, sha 5d165601b2c6)
- Data as of 2026-08-30T08:39:29.467469+00:00.