microsoft/msquic

Health v2 · maintenance only

Adoption not part of the score

4771 stars · 690 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

MsQuic is Microsoft's cross-platform C implementation of the IETF QUIC transport protocol (RFC 9000), with API wrappers for C++, C#, and Rust. It provides a general-purpose QUIC library for building fast, secure client and server applications over UDP with TLS encryption.

Use cases

• implement a QUIC server in C
• add QUIC transport to a Rust application
• use HTTP/3-style QUIC connections from C#
• build a low-latency secure transport layer over UDP
• replace TCP with QUIC for a custom protocol
• test QUIC protocol conformance
• implement stream multiplexing with 0-RTT connection setup

When to choose

• you need a production-grade, cross-platform QUIC implementation maintained by Microsoft
• you want QUIC bindings for C, C++, C#, or Rust from one library
• you need fine-grained control over QUIC streams, connection settings, and TLS
• you require support for recent QUIC RFCs and drafts (datagrams, version negotiation, ACK frequency)

When to avoid

• you just need HTTP/3 client or server functionality and prefer a higher-level HTTP library
• your stack is Python, Go, or Java with no native interop needs
• you need a pure managed or pure Rust implementation without a native C dependency
• you only need TCP/TLS and QUIC is not required

Facets

library · maturity stable

networking security http-client http-server sdk networking developer-tools security cross-platform windows cross-platform c cpp rust dotnet quic ietf-quic rfc9000 tls udp-transport c-library interop linux macos

Member repositories

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