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. MsQuic also has C++ API wrapper classes and exposes interop layers for both Rust and C#.

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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.
Kernel stack bypass via XDP.

Documentation

For platform support details, see the Platforms docs.
For release details, see the Release docs.
For performance data, see the Performance dashboard.
For building the library, see the Build docs.
For testing the library, see the Testing docs.
For using the API, see the API docs or the Sample.
For running a sample server and client app, see the Quick Start Guide.
For deploying QUIC, see the Deployment docs.
For diagnosing issues, see the Diagnostics docs and the Trouble Shooting Guide.
For other frequently asked questions, see the FAQs.

Contributing

For information on contributing, please see our contribution guidelines. Feel free to take a look at our Good First Issues list if you're looking for somewhere to start. If you'd just like to talk, come chat with us on Discord.

License

microsoft/msquic

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