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(VB.NET) WebSocket Connect through HTTP Proxy

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

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'  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.
' 

Dim rest As New Chilkat.Rest
Dim socket As New Chilkat.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.
Dim bTls As Boolean = False
Dim port As Integer = 80
Dim maxWaitMs As Integer = 5000
Dim success As Boolean = socket.Connect("some-websocket-server.com",port,bTls,maxWaitMs)
If (success <> True) Then
    Debug.WriteLine("Connect Failure Error Code: " & socket.ConnectFailReason)
    Debug.WriteLine(socket.LastErrorText)
    Exit Sub
End If


'  Tell the Rest object to use the connected socket.
success = rest.UseConnection(socket,True)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


Dim ws As New Chilkat.WebSocket

'  Tell the WebSocket to use this connection.
success = ws.UseConnection(rest)
If (success <> True) Then
    Debug.WriteLine(ws.LastErrorText)
    Exit Sub
End If


'  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.
Dim responseBody As String = rest.FullRequestNoBody("GET","/something")
If (rest.LastMethodSuccess <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


'  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..)
Dim statusCode As Integer = rest.ResponseStatusCode
Debug.WriteLine("Response status code: " & statusCode)

If (statusCode <> 101) Then
    Debug.WriteLine(responseBody)
    Debug.WriteLine("-- Failed because of unexpected response status code.")
    Exit Sub
End If


'  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) Then
    Debug.WriteLine(ws.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("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...)

Debug.WriteLine("Success.")

 

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