PowerBuilder

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. PowerBuilder

integer li_rc
long li_Success
oleobject loo_Rest
long li_BUseTls
oleobject loo_Ws
string ls_ResponseBody
long li_StatusCode

li_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.
//  

loo_Rest = create oleobject
li_rc = loo_Rest.ConnectToNewObject("Chilkat.Rest")
if li_rc < 0 then
    destroy loo_Rest
    MessageBox("Error","Connecting to COM object failed")
    return
end if
//  ------------------------------------------------------------------
//  To use TLS, connect to the TLS port (typically 443) and tell the rest.Connect method
//  that it's a TLS connection.
//  ------------------------------------------------------------------
li_BUseTls = 1
li_Success = loo_Rest.Connect("someserver.com",443,li_BUseTls,0)
if li_Success <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    return
end if

loo_Ws = create oleobject
li_rc = loo_Ws.ConnectToNewObject("Chilkat.WebSocket")

//  Tell the WebSocket to use this connection.
li_Success = loo_Ws.UseConnection(loo_Rest)
if li_Success <> 1 then
    Write-Debug loo_Ws.LastErrorText
    destroy loo_Rest
    destroy loo_Ws
    return
end if

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

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

//  Do the open handshake.
ls_ResponseBody = loo_Rest.FullRequestNoBody("GET","/something")
if loo_Rest.LastMethodSuccess <> 1 then
    Write-Debug loo_Rest.LastErrorText
    destroy loo_Rest
    destroy loo_Ws
    return
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..)
li_StatusCode = loo_Rest.ResponseStatusCode
Write-Debug "Response status code: " + string(li_StatusCode)

if li_StatusCode <> 101 then
    Write-Debug ls_ResponseBody
    Write-Debug "-- Failed because of unexpected response status code."
    destroy loo_Rest
    destroy loo_Ws
    return
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. 
li_Success = loo_Ws.ValidateServerHandshake()
if li_Success <> 1 then
    Write-Debug loo_Ws.LastErrorText
    destroy loo_Rest
    destroy loo_Ws
    return
end if

Write-Debug "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...)


destroy loo_Rest
destroy loo_Ws