WebSocket client for Python with low level API options
websocket-client is a WebSocket client for Python. It provides access to low level APIs for WebSockets. websocket-client implements version hybi-13 of the WebSocket procotol. This client does not currently support the permessage-deflate extension from RFC 7692.
This project's documentation can be found at https://websocket-client.readthedocs.io/
Please see the contribution guidelines
First, install the following dependencies:
- backports.ssl_match_hostname for Python 2.x
You can install the dependencies with the command
pip install six and
pip install backports.ssl_match_hostname
You can use either
python setup.py install or
pip install websocket-client
to install. This module is tested on Python 2.7 and Python 3.4+. Python 3
support was first introduced in version 0.14.0, but is a work in progress.
Check out the documentation's FAQ for additional guidelines: https://websocket-client.readthedocs.io/en/latest/faq.html
Known issues with this library include lack of WebSocket Compression support (RFC 7692) and minimal threading documentation/support.
- LGPL version 2.1
validate_utf8 methods are very slow in pure Python. You can
disable UTF8 validation in this library (and receive a performance enhancement)
skip_utf8_validation parameter. If you want to get better
performance, please install both numpy and wsaccel, and import them into your
project files - these other libraries will automatically be used when available.
Note that wsaccel can sometimes cause other issues.
Most real-world WebSockets situations involve longer-lived connections.
run_forever loop automatically tries to reconnect when a
connection is lost, and provides a variety of event-based connection controls.
The project documentation has
import websocket try: import thread except ImportError: import _thread as thread import time def on_message(ws, message): print(message) def on_error(ws, error): print(error) def on_close(ws): print("### closed ###") def on_open(ws): def run(*args): for i in range(3): time.sleep(1) ws.send("Hello %d" % i) time.sleep(1) ws.close() print("thread terminating...") thread.start_new_thread(run, ()) if __name__ == "__main__": websocket.enableTrace(True) ws = websocket.WebSocketApp("ws://echo.websocket.org/", on_open = on_open, on_message = on_message, on_error = on_error, on_close = on_close) ws.run_forever()
This is if you want to communicate a short message and disconnect immediately when done. For example, if you want to confirm that a WebSocket server is running and responds properly to a specific request. The project documentation has additional examples
from websocket import create_connection ws = create_connection("ws://echo.websocket.org/") print("Sending 'Hello, World'...") ws.send("Hello, World") print("Sent") print("Receiving...") result = ws.recv() print("Received '%s'" % result) ws.close()
If you want to customize socket options, set sockopt, as seen below:
from websocket import create_connection ws = create_connection("ws://echo.websocket.org/", sockopt=((socket.IPPROTO_TCP, socket.TCP_NODELAY),))
Thanks to @battlemidget and @ralphbean for helping migrate this project to Python 3.
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