(Swift 3,4,5...) WebSocket over TLS

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

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func chilkatTest() {
    // 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.
    // 

    let rest = CkoRest()!
    // ------------------------------------------------------------------
    // To use TLS, connect to the TLS port (typically 443) and tell the rest.Connect method
    // that it's a TLS connection.
    // ------------------------------------------------------------------
    var bUseTls: Bool = true
    var success: Bool = rest.connect("someserver.com", port: 443, tls: bUseTls, autoReconnect: false)
    if success != true {
        print("\(rest.lastErrorText!)")
        return
    }

    let ws = CkoWebSocket()!

    // Tell the WebSocket to use this connection.
    success = ws.useConnection(rest)
    if success != true {
        print("\(ws.lastErrorText!)")
        return
    }

    // 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", value: "x-something")
    rest.addHeader("Origin", value: "http://someserver.com")

    // Do the open handshake.
    var responseBody: String? = rest.fullRequestNoBody("GET", uriPath: "/something")
    if rest.lastMethodSuccess != true {
        print("\(rest.lastErrorText!)")
        return
    }

    // 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..)
    var statusCode: Int = rest.responseStatusCode.intValue
    print("Response status code: \(statusCode)")

    if statusCode != 101 {
        print("\(responseBody!)")
        print("-- Failed because of unexpected response status code.")
        return
    }

    // 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!)")
        return
    }

    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...)

}