websocket-client

websocket-client module is WebSocket client for python. This provide the low level APIs for WebSocket. All APIs are the synchronous functions.

websocket-client supports only hybi-13.

License

• LGPL

Installation

This module is tested on Python 2.7 and Python 3.x.

Type "python setup.py install" or "pip install websocket-client" to install.

Caution

from v0.16.0, we can install by "pip install websocket-client" for python 3.

This module depend on

• six
• backports.ssl_match_hostname for Python 2.x

How about Python 3

Now, we support python 3 on single source code from version 0.14.0. Thanks, @battlemidget and @ralphbean.

HTTP Proxy

Support websocket access via http proxy. The proxy server must allow "CONNECT" method to websocket port. Default squid setting is "ALLOWED TO CONNECT ONLY HTTPS PORT".

Current implementation of websocket-client is using "CONNECT" method via proxy.

example:

import websocket
ws = websocket.WebSocket()
ws.connect("ws://example.com/websocket", http_proxy_host="proxy_host_name", http_proxy_port=3128)
:

Example

Low Level API example:

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.

sockopt example:

from websocket import create_connection
ws = create_connection("ws://echo.websocket.org/",
                        sockopt=((socket.IPPROTO_TCP, socket.TCP_NODELAY),))

JavaScript websocket-like API example:

import websocket
import 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_message = on_message,
                              on_error = on_error,
                              on_close = on_close)
    ws.on_open = on_open
    ws.run_forever()

FAQ

How to disable ssl cert verification?

Please set sslopt to {"cert_reqs": ssl.CERT_NONE}.

WebSocketApp sample:

ws = websocket.WebSocketApp("wss://echo.websocket.org")
ws.run_forever(sslopt={"cert_reqs": ssl.CERT_NONE})

create_connection sample:

ws = websocket.create_connection("wss://echo.websocket.org",
  sslopt={"cert_reqs": ssl.CERT_NONE})

WebSocket sample:

ws = websocket.WebSocket(sslopt={"cert_reqs": ssl.CERT_NONE})
ws.connect("wss://echo.websocket.org")

How to disable hostname verification.

Please set sslopt to {"check_hostname": False}. (since v0.18.0)

WebSocketApp sample:

ws = websocket.WebSocketApp("wss://echo.websocket.org")
ws.run_forever(sslopt={"check_hostname": False})

create_connection sample:

ws = websocket.create_connection("wss://echo.websocket.org",
  sslopt={"check_hostname": False})

WebSocket sample:

ws = websocket.WebSocket(sslopt={"check_hostname": False})
ws.connect("wss://echo.websocket.org")

How to enable SNI? ------------------

SNI support is available for Python 2.7.9+ and 3.2+. It will be enabled automatically whenever possible.

Sub Protocols.

The server needs to support sub protocols, please set the subprotcol like this.

Subprotocol sample:

ws = websocket.create_connection("ws://exapmle.com/websocket", subprotocols=["binary", "base64"])

wsdump.py

wsdump.py is simple WebSocket test(debug) tool.

sample for echo.websocket.org:

$ wsdump.py ws://echo.websocket.org/
Press Ctrl+C to quit
> Hello, WebSocket
< Hello, WebSocket
> How are you?
< How are you?

Usage

usage::

wsdump.py [-h] [-v [VERBOSE]] ws_url

WebSocket Simple Dump Tool

positional arguments:

ws_url websocket url. ex. ws://echo.websocket.org/

optional arguments:

-h, --help show this help message and exit

WebSocketApp

-v VERBOSE, --verbose VERBOSE set verbose mode. If set to 1, show opcode. If set to 2, enable to trace websocket module

example:

$ wsdump.py ws://echo.websocket.org/
$ wsdump.py ws://echo.websocket.org/ -v
$ wsdump.py ws://echo.websocket.org/ -vv