trio-websocket
WebSocket library for Trio
Decision gist · record as of 2026-08-14
Yes, with conditions. Install if you're already committed to Trio and need WebSocket support; the library is stable and passes protocol compliance tests. However, be aware the project is on life-support maintenance with infrequent releases (535 days since last release). If you need only a WebSocket server and prefer a more actively maintained framework, consider quart-trio instead. No known security vulnerabilities.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8 or greater and the Trio async framework.
- Low friction install with 4 runtime dependencies.
- Project is on life-support maintenance; last release was 535 days ago.
License · maintenance · safety
permissive license (permissive) — Licensed under MIT (permissive), allowing commercial and private use with minimal restrictions.
last release 2025-02-25 (535 days) · last repo commit 2025-10-21 · 80 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 41,051,413 downloads/mo, #676 on PyPI
Alternatives
Verify before relying
pip install trio-websocket
import trio
from trio_websocket import open_websocket_url
async def main():
async with open_websocket_url('wss://echo.websocket.org') as ws:
await ws.send_message('hello')
msg = await ws.get_message()
print(msg)
trio.run(main)- Performance characteristics compared to alternatives like quart-trio mentioned in the README.
- Current maintenance commitment and roadmap given life-support status.
- Compatibility guarantees with newer Trio releases.
What it is and what it does
Trio WebSocket is a WebSocket protocol library that layers RFC 6455 compliance on top of the Trio async framework. It delegates protocol state machine logic to wsproto (a Sans-IO implementation) and handles I/O through Trio's async primitives, passing the Autobahn Test Suite for correctness. The library provides both client and server APIs: clients connect via context managers like `open_websocket_url()`, while servers accept connections through a handler coroutine pattern.
The package is currently on life-support maintenance, meaning development has slowed but the repository remains active. It supports Python 3.8 through 3.13 and works with both CPython and PyPy. The project acknowledges alternatives like quart-trio for users needing only server-side WebSocket support within a broader HTTP framework, though trio-websocket offers more flexibility for standalone bidirectional communication.
Use it for
- Build real-time chat or notification systems using Trio's async concurrency model.
- Implement WebSocket servers that handle multiple concurrent client connections.
- Create WebSocket clients that connect to remote servers and exchange messages asynchronously.
- Integrate WebSocket communication into Trio-based applications requiring bidirectional I/O.
- Test WebSocket protocol compliance using the Autobahn Test Suite validation.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, with conditions.
Install if you're already committed to Trio and need WebSocket support; the library is stable and passes protocol compliance tests. However, be aware the project is on life-support maintenance with infrequent releases (535 days since last release). If you need only a WebSocket server and prefer a more actively maintained framework, consider quart-trio instead. No known security vulnerabilities.
Install
trio-websocket on PyPI
Before you install
Low friction install with 4 runtime dependencies. Project is on life-support maintenance; last release was 535 days ago. Repository is active (last commit 2025-10-21) but marked as aging. Consider this when evaluating long-term support expectations.
Requires Python 3.8 or greater and the Trio async framework.
License in practice
Licensed under MIT (permissive), allowing commercial and private use with minimal restrictions.
Quickstart
pip install trio-websocket
import trio
from trio_websocket import open_websocket_url
async def main():
async with open_websocket_url('wss://echo.websocket.org') as ws:
await ws.send_message('hello')
msg = await ws.get_message()
print(msg)
trio.run(main)Verify before relying
- Performance characteristics compared to alternatives like quart-trio mentioned in the README.
- Current maintenance commitment and roadmap given life-support status.
- Compatibility guarantees with newer Trio releases.
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release >=3.8 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 4 packagesoutcometriowsprotoexceptiongroup |
| Maintenance | Aging 535 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 41,051,413 / month, #676 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 3 - AlphaIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyTopic :: Software Development :: LibrariesTyping :: Typed |
Evidence: trio_websocket-0.12.2-py3-none-any.whl
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See also websockets · ws4py · wsproto · autobahn · trio · sniffio · websocket-client · simple-websocket · Hypercorn · centrifuge-python