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 protocol. 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
You can use either
python3 setup.py install or
pip3 install websocket-client
to install. This module is tested on Python 3.7+.
There are several optional dependencies that can be installed to enable specific websocket-client features.
- To install
python-socksfor proxy usage and
wsaccelfor a minor performance boost, use:
pip3 install websocket-client[optional]
- To install
websocketsto run unit tests using the local echo server, use:
pip3 install websocket-client[test]
- To install
sphinx_rtd_themeto build project documentation, use:
pip3 install websocket-client[docs]
Footnote: Some shells, such as zsh, require you to escape the
] characters with a
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.
validate_utf8 methods can sometimes be bottleneck.
You can disable UTF8 validation in this library (and receive a
performance enhancement) with the
If you want to get better performance, install wsaccel. While
websocket-client does not depend on wsaccel, it will be used if
available. wsaccel doubles the speed of UTF8 validation and
offers a very minor 10% performance boost when masking the
payload data as part of the
send process. Numpy used to
be a suggested performance enhancement alternative, but
found it didn't help.
Many more examples are found in the examples documentation.
Most real-world WebSockets situations involve longer-lived connections.
run_forever loop will automatically try to reconnect when a
connection is lost if it is provided with a dispatcher parameter,
and provides a variety of event-based connection controls.
This example uses rel
for the dispatcher to provide automatic reconnection.
import websocket import _thread import time import rel def on_message(ws, message): print(message) def on_error(ws, error): print(error) def on_close(ws, close_status_code, close_msg): print("### closed ###") def on_open(ws): print("Opened connection") if __name__ == "__main__": websocket.enableTrace(True) ws = websocket.WebSocketApp("wss://api.gemini.com/v1/marketdata/BTCUSD", on_open=on_open, on_message=on_message, on_error=on_error, on_close=on_close) ws.run_forever(dispatcher=rel) # Set dispatcher to automatic reconnection rel.signal(2, rel.abort) # Keyboard Interrupt rel.dispatch()
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.
from websocket import create_connection ws = create_connection("ws://echo.websocket.events/") print(ws.recv()) 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.events/", sockopt=((socket.IPPROTO_TCP, socket.TCP_NODELAY),))
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