Chilkat2-Python

Send and Receive WebSocket Frame

See more WebSocket Examples

Demonstrates how to send a websocket text frame to a websocket echo server. This example uses Chilkat's websocket test echo server at ws://websockets.chilkat.io/wsChilkatEcho.ashx

Note: The websockets.chilkat.io server imposes the following limitations:
Messages must be 16K or less, and each connection is limited to a max of 16 echoed messages.

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.

ws = chilkat2.WebSocket()

# For brevity, this example does not check for errors when etablishing the WebSocket connection.
# See Establish WebSocket Connection for more complete sample code for making the connection.

rest = chilkat2.Rest()
# Connect to websockets.chilkat.io
# IMPORTANT: websockets.chilkat.io accepts frames of up to 16K in size and echoes them back.
# IMPORTANT: The websockets.chilkat.io server imposes the following limitations: 
# ---------- Messages must be 16K or less, and each connection is limited to a max of 16 echoed messages.
success = rest.Connect("websockets.chilkat.io",80,False,False)
ws.UseConnection(rest)
ws.AddClientHeaders()
responseBodyIgnored = rest.FullRequestNoBody("GET","/wsChilkatEcho.ashx")
success = ws.ValidateServerHandshake()
if (success != True):
    print(ws.LastErrorText)
    sys.exit()

# This example demonstrates sending a frame and receiving a text frame.

# Send a frame containing the string "Hello World!"
# This will be the first and final frame, and therefore this constitutes the entire message.
finalFrame = True
success = ws.SendFrame("Hello World!",finalFrame)
if (success != True):
    print(ws.LastErrorText)
    sys.exit()

# Read an incoming frame.
success = ws.ReadFrame()
if (success != True):
    print("Failed to receive a frame")
    print("ReadFrame fail reason = " + str(ws.ReadFrameFailReason))
    print(ws.LastErrorText)
    sys.exit()

# Show the string that was received.
receivedStr = ws.GetFrameData()
print("Received: " + receivedStr)

# Close the websocket connection.
success = ws.SendClose(True,1000,"Closing this websocket.")
if (success != True):
    print(ws.LastErrorText)
    sys.exit()

# Read the Close response.
success = ws.ReadFrame()
if (success != True):
    print("ReadFrame fail reason = " + str(ws.ReadFrameFailReason))
    print(ws.LastErrorText)
    sys.exit()

# Should receive the "Close" opcode.
print("Received opcode: " + ws.FrameOpcode)
# Should be the same status code we sent (1000)
print("Received close status code: " + str(ws.CloseStatusCode))
# The server may echo the close reason.  If not, this will be empty.
print("Echoed close reason: " + ws.CloseReason)

print("Success.")