[](https://discord.gg/YGAtCwTSsc)
[](https://microsoft.github.io/msquic/msquicdocs/docs/API.html)
[](https://microsoft.github.io/netperf/dist/)
[](https://codecov.io/github/microsoft/msquic)
[](https://crates.io/crates/msquic)
[](https://www.nuget.org/profiles/msquic)
[](https://bestpractices.coreinfrastructure.org/projects/4846)
MsQuic is a Microsoft implementation of the [IETF QUIC](https://datatracker.ietf.org/wg/quic/about/)
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](https://docs.rs/msquic/latest/msquic/) and C#.
## Protocol Features
[](https://tools.ietf.org/html/rfc9000)
[](https://tools.ietf.org/html/rfc9001)
[](https://tools.ietf.org/html/rfc9002)
[](https://tools.ietf.org/html/rfc9221)
[](https://tools.ietf.org/html/rfc9287)
[](https://tools.ietf.org/html/rfc9368)
[](https://tools.ietf.org/html/rfc9369)
[](https://tools.ietf.org/html/draft-ietf-quic-load-balancers)
[](https://tools.ietf.org/html/draft-ietf-quic-ack-frequency)
[](https://tools.ietf.org/html/draft-banks-quic-disable-encryption)
[](https://tools.ietf.org/html/draft-banks-quic-performance)
[](https://tools.ietf.org/html/draft-banks-quic-cibir)
[](https://tools.ietf.org/html/draft-huitema-quic-ts)
[](https://datatracker.ietf.org/doc/draft-ietf-quic-reliable-stream-reset/)
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](https://docs.microsoft.com/en-us/windows-hardware/drivers/network/introduction-to-receive-side-scaling)) support.
* UDP send and receive coalescing support.
* Kernel stack bypass via [XDP](https://github.com/microsoft/xdp-for-windows?tab=readme-ov-file#xdp-for-windows).
# Documentation