Cross-platform, C implementation of the IETF QUIC protocol, exposed to C, C++, C# and Rust.
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README.md

MsQuic

MsQuic is a Microsoft implementation of the IETF QUIC protocol. It is cross platform, written in C and designed to be a general purpose QUIC library.

Important The QUIC protocol is not an official RFC yet. It has been approved by the IESG and now is in the RFC editor queue (final step).

IETF Drafts: Transport, TLS, Recovery, Datagram, Load Balancing, Version Negotiation

Build Status Test Status Perf Dashboard Code Coverage CodeQL Language grade: C/C++ CII Best Practices Discord

Protocol Features

QUIC has many benefits when compared to existing "TLS over TCP" scenarios:

  • All packets are encrypted and handshake is authenticated with TLS 1.3.
  • Parallel streams of (reliable and unreliable) application data.
  • Exchange application data in the first round trip (0-RTT).
  • Improved congestion control and loss recovery.
  • Survives a change in the clients IP address or port.
  • Stateless load balancing.
  • Easily extendable for new features and extensions.

Library Features

MsQuic has several features that differentiates it from other QUIC implementations:

  • Optimized for client and server.
  • Optimized for maximal throughput and minimal latency.
  • Asynchronous IO.
  • Receive side scaling (RSS) support.
  • UDP send and receive coalescing support.

Documentation

Contributing

For information on contributing, please see our contribution guidlines. Feel free to take a look at our Good First Issues list if you're looking for somewhere to start.