(.NET Core C#) WebSocket Connect

Demonstrates how to establish a WebSocket connection. Once the connection is established, messages may be sent back-and-forth. Messages are sent in frames, where the last frame in the message is indicated by a "final" bit. A frame constitutes the entire message if the first frame sent has the "final" bit sent. (In most cases, you'll probably be sending single-frame messages.)

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//  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.
// 

Chilkat.Rest rest = new Chilkat.Rest();
bool success = rest.Connect("someserver.com",80,false,false);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

Chilkat.WebSocket ws = new Chilkat.WebSocket();

//  Tell the WebSocket to use this connection.
success = ws.UseConnection(rest);
if (success != true) {
    Debug.WriteLine(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","x-something");
rest.AddHeader("Origin","http://someserver.com");

//  Do the open handshake.
string responseBody = rest.FullRequestNoBody("GET","/something");
if (rest.LastMethodSuccess != true) {
    Debug.WriteLine(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..)
int statusCode = rest.ResponseStatusCode;
Debug.WriteLine("Response status code: " + Convert.ToString(statusCode));

if (statusCode != 101) {
    Debug.WriteLine(responseBody);
    Debug.WriteLine("-- 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) {
    Debug.WriteLine(ws.LastErrorText);
    return;
}

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 object...)