Visual Basic 6.0

WebSocket over TLS

See more WebSocket Examples

Establishing a WebSocket connection over TLS is exactly the same as for TCP, except for a few arguments passed to the Connect method. Visual Basic 6.0

Dim success As Long
success = 0

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

' --------------------------------------------------
' A WebSocket connection begins life as an HTTP GET request containing a few special header fields,
' such as "Upgrade: websocket".   

' Your application will use the Chilkat Rest class to send the initial HTTP GET.  This allows you
' to use the full capability of the Chilkat Rest class to customize the GET for any particular situation.
' For example:
' 
'   - If custom HTTP request header fields must be added.
'   - If authentication is required, such as OAuth2, OAuth1, Basic HTTP Auth, etc.
'   - If HTTPS, SSH Tunneling, Proxies (HTTP or SOCKS), or other advanced connection or TLS features are required.
' 

Dim rest As New ChilkatRest
' ------------------------------------------------------------------
' To use TLS, connect to the TLS port (typically 443) and tell the rest.Connect method
' that it's a TLS connection.
' ------------------------------------------------------------------
Dim bUseTls As Long
bUseTls = 1
success = rest.Connect("someserver.com",443,bUseTls,0)
If (success <> 1) Then
    Debug.Print rest.LastErrorText
    Exit Sub
End If

Dim ws As New ChilkatWebSocket

' Tell the WebSocket to use this connection.
success = ws.UseConnection(rest)
If (success <> 1) Then
    Debug.Print 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.)
success = ws.AddClientHeaders()

' Add any additional headers that might be desired.
' Two common WebSocketSpecific headers are "Sec-WebSocket-Protocol" and "Origin".
success = rest.AddHeader("Sec-WebSocket-Protocol","x-something")
success = rest.AddHeader("Origin","http://someserver.com")

' Do the open handshake.
Dim responseBody As String
responseBody = rest.FullRequestNoBody("GET","/something")
If (rest.LastMethodSuccess <> 1) Then
    Debug.Print 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 Long
statusCode = rest.ResponseStatusCode
Debug.Print "Response status code: " & statusCode

If (statusCode <> 101) Then
    Debug.Print responseBody
    Debug.Print "-- 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 <> 1) Then
    Debug.Print ws.LastErrorText
    Exit Sub
End If

Debug.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 object...)