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< h1 align = "center" > < img src = "docs/images/readme_logo.png" width = "500" alt = "MsQuic logo" / > < / h1 >
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[](https://microsoft.github.io/msquic/)
[](https://dev.azure.com/ms/msquic/_build/latest?definitionId=347& branchName=main)
[](https://dev.azure.com/ms/msquic/_build/latest?definitionId=347& branchName=main)
[](https://bestpractices.coreinfrastructure.org/projects/4846)
[](https://discord.gg/YGAtCwTSsc)
[](https://crates.io/crates/msquic)
[](https://www.nuget.org/profiles/msquic)
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MsQuic is a Microsoft implementation of the [IETF QUIC ](https://datatracker.ietf.org/wg/quic/about/ )
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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
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[](https://tools.ietf.org/html/rfc9000)
[](https://tools.ietf.org/html/rfc9001)
[](https://tools.ietf.org/html/rfc9002)
[](https://tools.ietf.org/html/rfc9221)
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[](https://tools.ietf.org/html/rfc9287)
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[](https://tools.ietf.org/html/draft-ietf-quic-v2)
[](https://tools.ietf.org/html/draft-ietf-quic-version-negotiation)
[](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)
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QUIC has many benefits when compared to existing "TLS over TCP" scenarios:
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* All packets are encrypted and handshake is authenticated with TLS 1.3.
* Parallel streams of (reliable and unreliable) application data.
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* Exchange application data in the first round trip (0-RTT).
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* Improved congestion control and loss recovery.
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* Survives a change in the clients IP address or port.
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* Stateless load balancing.
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* Easily extendable for new features and extensions.
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## Library Features
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MsQuic has several features that differentiates it from other QUIC implementations:
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* Optimized for client and server.
* Optimized for maximal throughput and minimal latency.
* Asynchronous IO.
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* Receive side scaling ([RSS](https://docs.microsoft.com/en-us/windows-hardware/drivers/network/introduction-to-receive-side-scaling)) support.
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* UDP send and receive coalescing support.
# Documentation
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* For platform support details, see the [Platforms docs ](./docs/Platforms.md ).
* For release details, see the [Release docs ](./docs/Release.md ).
* For performance data, see the [Performance dashboard ](https://aka.ms/msquicperformance ).
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* For building the library, see the [Build docs ](./docs/BUILD.md ).
* For testing the library, see the [Testing docs ](./docs/TEST.md ).
* For using the API, see the [API docs ](./docs/API.md ) or the [Sample ](./src/tools/sample/sample.c ).
* For deploying QUIC, see the [Deployment docs ](./docs/Deployment.md ).
* For diagnosing issues, see the [Diagnostics docs ](./docs/Diagnostics.md ) and the [Trouble Shooting Guide ](./docs/TSG.md ).
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* For other frequently asked questions, see the [FAQs ](./docs/FAQ.md ).
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# Contributing
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For information on contributing, please see our [contribution guidelines ](./.github/CONTRIBUTING.md ). Feel free to take a look at our [Good First Issues ](https://github.com/microsoft/msquic/labels/good%20first%20issue ) list if you're looking for somewhere to start. If you'd just like to talk, come chat with us [on Discord ](https://discord.gg/YGAtCwTSsc ).
