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QUIC and HTTP/3 implementation in Python
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What is aioquic?

aioquic is a library for the QUIC network protocol in Python. It features a minimal TLS 1.3 implementation, a QUIC stack and an HTTP/3 stack.

QUIC standardisation is not finalised yet, but aioquic closely tracks the specification drafts and is regularly tested for interoperability against other QUIC implementations.

To learn more about aioquic please read the documentation.

Why should I use aioquic?

aioquic has been designed to be embedded into Python client and server libraries wishing to support QUIC and / or HTTP/3. The goal is to provide a common codebase for Python libraries in the hope of avoiding duplicated effort.

Both the QUIC and the HTTP/3 APIs follow the "bring your own I/O" pattern, leaving actual I/O operations to the API user. This approach has a number of advantages including making the code testable and allowing integration with different concurrency models.


  • QUIC stack conforming with draft-23
  • HTTP/3 stack conforming with draft-23
  • minimal TLS 1.3 implementation
  • IPv4 and IPv6 support
  • connection migration and NAT rebinding
  • logging TLS traffic secrets
  • logging QUIC events in QLOG format
  • HTTP/3 server push support

Running the examples

aioquic requires Python 3.6 or better, and the OpenSSL development headers.

$ sudo apt install libssl-dev python3-dev

After checking out the code using git you can run:

$ pip install -e .
$ pip install aiofiles asgiref httpbin starlette wsproto

HTTP/3 server

You can run the example server, which handles both HTTP/0.9 and HTTP/3:

$ python examples/ --certificate tests/ssl_cert.pem --private-key tests/ssl_key.pem

HTTP/3 client

You can run the example client to perform an HTTP/3 request:

$ python examples/ --ca-certs tests/pycacert.pem https://localhost:4433/

Alternatively you can perform an HTTP/0.9 request:

$ python examples/ --ca-certs tests/pycacert.pem --legacy-http https://localhost:4433/

You can also open a WebSocket over HTTP/3:

$ python examples/ --ca-certs tests/pycacert.pem wss://localhost:4433/ws


aioquic is released under the BSD license.

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