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webtransport-py

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webtransport-py について

webtransport-py は Sans I/O アーキテクチャを採用した WebTransport の Python ライブラリです。WebTransport over HTTP/3 と WebTransport over HTTP/2 の両方に対応しています。

また、WebTransport だけでなく QUIC、HTTP/3、HTTP/2 を単体のプロトコルとしても利用できます。asyncio、スレッド、独自のイベントループなど、任意の I/O フレームワークと組み合わせて利用できます。

特徴

Sans I/O アーキテクチャ
- I/O 処理をライブラリ外部で制御可能
- 任意のイベントループやフレームワークと統合可能
- Sans I/O
二層 API 設計
- Sans I/O API: プロトコル処理のみを提供する低レベル API
- asyncio API: すぐに使える高レベルなクライアント/サーバー実装
QUIC
- Sans I/O API と asyncio API の両方を提供
- 双方向/単方向ストリーム
- QUIC DATAGRAM
- 0-RTT / Session Resumption
- 証明書のカスタム検証
- ngtcp2 を採用
HTTP/3
- Sans I/O API と asyncio API の両方を提供
- nghttp3 を採用
HTTP/2
- Sans I/O API と asyncio API の両方を提供
- nghttp2 を採用
WebTransport over HTTP/3
- Sans I/O API と asyncio API の両方を提供
WebTransport over HTTP/2
- Sans I/O API と asyncio API の両方を提供
Python Free-Threading 対応
- PEP 703 – Making the Global Interpreter Lock Optional in CPython | peps.python.org
- Python Free-Threading Guide
クロスプラットフォーム対応
- macOS arm64
- Ubuntu x86_64 / arm64
- Windows x86_64

インストール

uv add webtransport-py

使い方

WebTransport over HTTP/3

サーバー

import asyncio

from webtransport import h3


async def main() -> None:
    server = h3.Server(
        host="0.0.0.0",
        port=4433,
        certfile="cert.pem",
        keyfile="key.pem",
    )

    async def on_session_ready(session_id: int, addr: tuple[str, int]) -> None:
        print(f"セッション確立: {session_id} from {addr}")

    async def on_stream_data(
        session_id: int,
        stream_id: int,
        data: bytes,
        addr: tuple[str, int],
    ) -> None:
        print(f"データ受信: {data}")
        # エコーバック
        await server.send_stream_data(addr, stream_id, data)

    async def on_datagram(session_id: int, data: bytes, addr: tuple[str, int]) -> None:
        print(f"データグラム受信: {data}")
        # エコーバック
        await server.send_datagram(addr, session_id, data)

    server.on_session_ready(on_session_ready)
    server.on_stream_data(on_stream_data)
    server.on_datagram(on_datagram)

    async with server:
        print(f"サーバー開始: {server.host}:{server.actual_port}")
        await server.run()


if __name__ == "__main__":
    asyncio.run(main())

クライアント

import asyncio

from webtransport import h3


async def main() -> None:
    client = h3.Client(
        url="https://localhost:4433/webtransport",
        verify_peer=False,
    )

    async def on_stream_data(stream_id: int, data: bytes) -> None:
        print(f"データ受信: {data}")

    async def on_datagram(data: bytes) -> None:
        print(f"データグラム受信: {data}")

    client.on_stream_data(on_stream_data)
    client.on_datagram(on_datagram)

    if not await client.connect():
        print("接続失敗")
        return

    # ストリームでデータ送信
    stream_id = await client.open_stream()
    await client.send_stream_data(stream_id, b"Hello via stream!")

    # データグラムでデータ送信
    await client.send_datagram(b"Hello via datagram!")

    try:
        await asyncio.wait_for(client.run(), timeout=5.0)
    except TimeoutError:
        pass

    await client.close()


if __name__ == "__main__":
    asyncio.run(main())

QUIC

サーバー

import asyncio

from webtransport import quic


async def main() -> None:
    server = quic.Server(
        host="0.0.0.0",
        port=4433,
        certfile="cert.pem",
        keyfile="key.pem",
    )

    async def on_handshake_completed(addr: tuple[str, int]) -> None:
        print(f"ハンドシェイク完了: {addr}")

    async def on_stream_data(
        stream_id: int,
        data: bytes,
        fin: bool,
        addr: tuple[str, int],
    ) -> None:
        print(f"データ受信: {data}")
        # エコーバック
        await server.send_stream_data(addr, stream_id, data, fin)

    server.on_handshake_completed(on_handshake_completed)
    server.on_stream_data(on_stream_data)

    async with server:
        print(f"サーバー開始: {server.host}:{server.actual_port}")
        await server.run()


if __name__ == "__main__":
    asyncio.run(main())

クライアント

import asyncio

from webtransport import quic


async def main() -> None:
    client = quic.Client(
        host="localhost",
        port=4433,
        verify_peer=False,
    )

    async def on_stream_data(stream_id: int, data: bytes, fin: bool) -> None:
        print(f"データ受信: {data}")

    client.on_stream_data(on_stream_data)

    if not await client.connect():
        print("接続失敗")
        return

    # 双方向ストリームを開いてデータ送信
    stream_id = await client.open_stream(bidirectional=True)
    await client.send_stream_data(stream_id, b"Hello, QUIC!")

    try:
        await asyncio.wait_for(client.run(), timeout=5.0)
    except TimeoutError:
        pass

    await client.close()


if __name__ == "__main__":
    asyncio.run(main())

Python

3.14
3.14t

プラットフォーム

macOS 26 arm64
macOS 15 arm64
Ubuntu 24.04 LTS x86_64
Ubuntu 24.04 LTS arm64
Ubuntu 22.04 LTS x86_64
Ubuntu 22.04 LTS arm64
Windows 2025 x86_64
Windows 11 x86_64

リリースビルド

make wheel

開発ビルド

make develop

テスト

uv sync
make test

サンプル

examples/ ディレクトリにサンプルコードがあります。

ngtcp2 ライセンス

https://github.com/ngtcp2/ngtcp2/blob/main/COPYING

The MIT License

Copyright (c) 2016 ngtcp2 contributors

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

nghttp3 ライセンス

https://github.com/ngtcp2/nghttp3/blob/main/COPYING

The MIT License

Copyright (c) 2019 nghttp3 contributors

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

nghttp2 ライセンス

https://github.com/nghttp2/nghttp2/blob/master/COPYING

The MIT License

Copyright (c) 2012, 2014, 2015, 2016 Tatsuhiro Tsujikawa
Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

ライセンス

Apache License 2.0

Copyright 2026-2026, Shiguredo Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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webtransport-py 2026.1.0.dev1

webtransport-py

About Shiguredo's open source software

時雨堂のオープンソースソフトウェアについて

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WebTransport over HTTP/3

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