Node.js

Duplicate Python websockets

See more WebSocket Examples

Demonstrates how to duplicate the following Python client-side websocket snippet:

async with websockets.connect('ws://192.168.1.35/websocket') as websocket:
await websocket.send("http.controller_login:username=xxx&password=xxxxx")
response = await websocket.recv()

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    //  In Python, the following line of code does more than just connect:
    //  
    //       websockets.connect('ws://192.168.1.35/websocket')
    //  
    //  It is connecting to 192.168.1.35 without using TLS.  If the URI starts with "wss://", then TLS should be used.
    //  But this URI begins with just "ws:/", so no TLS.

    //  Also, after connecting, a GET request is sent to the /websocket endpoint.
    //  In summary, the websockets.connect function is establishing the connection and it sends a GET request.

    //  First establish the connection.
    //  No TLS, use the default HTTP port 80.
    var rest = new chilkat.Rest();
    success = rest.Connect("192.168.1.35",80,false,false);
    if (success !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    var ws = new chilkat.WebSocket();

    //  Tell the WebSocket to use this connection.
    success = ws.UseConnection(rest);
    if (success !== true) {
        console.log(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();

    //  Now send the GET request to /websockets.
    var responseBody = rest.FullRequestNoBody("GET","/websockets");
    if (rest.LastMethodSuccess !== true) {
        console.log(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 = rest.ResponseStatusCode;
    console.log("Response status code: " + statusCode);

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

    //  We have the expected 101 response, so let's now validate the 
    //  contents of the response.
    success = ws.ValidateServerHandshake();
    if (success !== true) {
        console.log(ws.LastErrorText);
        return;
    }

    console.log("WebSocket connection successful.");

    //  The application may now begin sending and receiving frames on the WebSocket connection.

    //  The 1st frame sent by the Python snippet is:
    //  
    //      websocket.send("http.controller_login:username=xxx&password=xxxxx")
    //  

    //  Send the same using Chilkat, and get the response.
    var finalFrame = true;
    success = ws.SendFrame("http.controller_login:username=xxx&password=xxxxx",finalFrame);
    if (success !== true) {
        console.log(ws.LastErrorText);
        return;
    }

    //  Read an incoming frame.
    success = ws.ReadFrame();
    if (success !== true) {
        console.log("Failed to receive a frame");
        console.log("ReadFrame fail reason = " + ws.ReadFrameFailReason);
        console.log(ws.LastErrorText);
        return;
    }

    //  Show the string that was received.
    var receivedStr = ws.GetFrameData();
    console.log("Received: " + receivedStr);

    //  Continue with whatever additional communications are desired...
    //  ....
    //  

}

chilkatExample();