quic-go
A production-ready, pure Go implementation of the QUIC and HTTP/3 protocols.
What is quic-go?
quic-go is a Go library that implements the QUIC transport protocol and HTTP/3, providing a modern, multiplexed, and secure alternative to TCP/TLS. It solves the problem of network latency and head-of-line blocking by enabling faster connection establishment and improved data delivery for applications like web servers, proxies, and real-time systems.
Go developers building network services, web servers, reverse proxies, tunneling software, or any application that benefits from reduced latency and modern transport protocols.
Developers choose quic-go for its production-ready, standards-compliant implementation in pure Go, its extensive adoption by major open-source projects, and its active maintenance that keeps pace with the latest IETF QUIC and HTTP/3 specifications.
Overview
A production-ready QUIC implementation in pure Go
Use Cases
Best For
- Adding HTTP/3 support to Go-based web servers and proxies
- Building low-latency network tunneling or VPN software
- Implementing real-time communication services that require multiplexed streams
- Developing high-performance reverse proxies and application gateways
- Creating custom network protocols that benefit from QUIC's security and connection migration
- Enhancing existing Go applications with modern transport layer capabilities
Not Ideal For
- Projects not written in Go or requiring cross-language transport libraries
- Legacy network environments where middleboxes block or degrade QUIC traffic
- Applications where TCP's ubiquitous tooling and debugging support are non-negotiable
Pros & Cons
Pros
Implements all core QUIC and HTTP/3 RFCs (9000-9002, 9114) plus extensions like Unreliable Datagrams and QUIC Version 2, ensuring up-to-date interoperability.
Used by major projects like Caddy, Traefik, and Cloudflare's cloudflared, as listed in the README, demonstrating stability in high-stakes environments.
Has no external dependencies, making integration straightforward for Go-based systems and leveraging Go's cross-platform strengths.
Follows the latest IETF standards and supports the newest two Go releases, keeping pace with QUIC's rapid development.
Cons
QUIC's advanced features introduce a steeper learning curve and potential performance overhead compared to traditional TCP, requiring deeper network expertise.
Key extensions like WebTransport are implemented in a separate repository (webtransport-go), adding integration steps for developers needing those capabilities.
Only supports the latest two Go releases, which can hinder adoption in environments with fixed or legacy Go toolchains.
Frequently Asked Questions
Related Projects
fasthttpFast HTTP package for Go. Tuned for high performance. Zero memory allocations in hot paths. Up to 10x faster than net/http
webrtcPure Go implementation of the WebRTC API
cloudflaredCloudflare Tunnel client
kcptunReliable UDP Transmission Optimizer based on KCP: Enhancing network efficiency in poor connectivity environments.
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