qh3¶

QUIC and HTTP/3 for Python, with a native Rust transport core.

qh3 is a maintained fork of aioquic for applications that need a focused, high-performance QUIC and HTTP/3 implementation. It provides:

a convenient asyncio client and server API;
sans-I/O QUIC and HTTP/3 APIs for custom event loops and transports;
QUIC v1 and v2, TLS 1.3, IPv4 and IPv6, connection migration, QLOG, datagrams, server push, WebTransport streams, ECH, and post-quantum key exchange;
native packet processing and UDP batching implemented in Rust.

Install¶

python -m pip install qh3

qh3 supports CPython and PyPy 3.7 or newer.

Choose an API¶

Goal	Start here
Open or serve QUIC connections with `asyncio`	Asyncio guide
Integrate QUIC into another I/O framework	Sans-I/O guide
Send HTTP/3 headers, data, or datagrams	HTTP/3 API
Configure TLS, certificates, limits, or versions	Configuration

API policy¶

Only interfaces listed in the public API reference are part of the supported API. In particular, qh3._hazmat and underscore-prefixed modules are implementation details and may change without notice.

qh3 is low-level infrastructure. Applications looking for a complete HTTP client should generally use Niquests or urllib3.future.

Get started Browse the API