Chilkat2-Python

WebSocket Connect through HTTP Proxy

See more WebSocket Examples

This example shows how to establish a WebSocket connection through an HTTP proxy server. Chilkat2-Python

import sys
import chilkat2

success = False

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# --------------------------------------------------
# This example borrows the code from the REST using HTTP Proxy example.
# We first use the Chilkat Socket object to establish a connection to the WebSocket server through an HTTP proxy.
# Next, the Rest object uses the Socket object for its connection.
# Finally, the WebSocket object uses the Rest object for its connection.  
# 

rest = chilkat2.Rest()
socket = chilkat2.Socket()

# Set the HTTP proxy domain or IP address, and port.
socket.HttpProxyHostname = "192.168.1.79"
socket.HttpProxyPort = 808

# Provide authentication to the HTTP proxy, if needed.
socket.HttpProxyUsername = "HTTP_PROXY_LOGIN"
socket.HttpProxyPassword = "HTTP_PROXY_PASSWORD"
socket.HttpProxyAuthMethod = "Basic"

# Indicate that HTTP requests (i.e. the WebSocket opening handshake) will be sent over the socket.
# This is important for how the HTTP proxy connection is established.
socket.HttpProxyForHttp = True

# Connect to the websocket server through the HTTP proxy.
bTls = False
port = 80
maxWaitMs = 5000
success = socket.Connect("some-websocket-server.com",port,bTls,maxWaitMs)
if (success != True):
    print("Connect Failure Error Code: " + str(socket.ConnectFailReason))
    print(socket.LastErrorText)
    sys.exit()

# Tell the Rest object to use the connected socket.
success = rest.UseConnection(socket,True)
if (success != True):
    print(rest.LastErrorText)
    sys.exit()

ws = chilkat2.WebSocket()

# Tell the WebSocket to use this connection.
success = ws.UseConnection(rest)
if (success != True):
    print(ws.LastErrorText)
    sys.exit()

# Add the standard WebSocket open handshake headers that will be needed.
# (This adds the required HTTP request headers to the rest object.)
ws.AddClientHeaders()

# Add any additional headers that might be desired.
# Two common WebSocketSpecific headers are "Sec-WebSocket-Protocol" and "Origin".
rest.AddHeader("Sec-WebSocket-Protocol","x-some-websocket-subprotocol")
rest.AddHeader("Origin","http://some-websocket-server.com")

# Do the open handshake.
responseBody = rest.FullRequestNoBody("GET","/something")
if (rest.LastMethodSuccess != True):
    print(rest.LastErrorText)
    sys.exit()

# If successful, the HTTP response status code should be 101,
# and the response body will be empty. (If it failed, we'll have a look
# at the response body..)
statusCode = rest.ResponseStatusCode
print("Response status code: " + str(statusCode))

if (statusCode != 101):
    print(responseBody)
    print("-- Failed because of unexpected response status code.")
    sys.exit()

# We have the expected 101 response, so let's now validate the 
# contents of the response, such as the value sent by the server in the
# Sec-WebSocket-Accept header. 
success = ws.ValidateServerHandshake()
if (success != True):
    print(ws.LastErrorText)
    sys.exit()

print("WebSocket connection successful.")

# The application may now begin sending and receiving frames on the WebSocket connection.
# (At this point, we're done with the rest and socket objects...)

print("Success.")