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Node.js Examples

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(Node.js) WebSocket Connect through HTTP Proxy

This example shows how to establish a WebSocket connection through an HTTP proxy server.

Install Chilkat for Node.js and Electron using npm at

Chilkat npm packages for Node.js

Chilkat npm packages for Electron

on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node11-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node11-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node11-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node11-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node11-linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('@chilkat/ck-node11-macosx');
}

function chilkatExample() {

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

    // --------------------------------------------------
    // This example borrows the code from the REST using HTTP Proxy example.
    // We first use the Chilkat Socket object to establish a connection to the WebSocket server through an HTTP proxy.
    // Next, the Rest object uses the Socket object for its connection.
    // Finally, the WebSocket object uses the Rest object for its connection.  
    // 

    var rest = new chilkat.Rest();
    var socket = new chilkat.Socket();

    // Set the HTTP proxy domain or IP address, and port.
    socket.HttpProxyHostname = "192.168.1.79";
    socket.HttpProxyPort = 808;

    // Provide authentication to the HTTP proxy, if needed.
    socket.HttpProxyUsername = "HTTP_PROXY_LOGIN";
    socket.HttpProxyPassword = "HTTP_PROXY_PASSWORD";
    socket.HttpProxyAuthMethod = "Basic";

    // Indicate that HTTP requests (i.e. the WebSocket opening handshake) will be sent over the socket.
    // This is important for how the HTTP proxy connection is established.
    socket.HttpProxyForHttp = true;

    // Connect to the websocket server through the HTTP proxy.
    var bTls = false;
    var port = 80;
    var maxWaitMs = 5000;
    var success = socket.Connect("some-websocket-server.com",port,bTls,maxWaitMs);
    if (success !== true) {
        console.log("Connect Failure Error Code: " + socket.ConnectFailReason);
        console.log(socket.LastErrorText);
        return;
    }

    // Tell the Rest object to use the connected socket.
    success = rest.UseConnection(socket,true);
    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();

    // Add any additional headers that might be desired.
    // Two common WebSocketSpecific headers are "Sec-WebSocket-Protocol" and "Origin".
    rest.AddHeader("Sec-WebSocket-Protocol","x-some-websocket-subprotocol");
    rest.AddHeader("Origin","http://some-websocket-server.com");

    // Do the open handshake.
    var responseBody = rest.FullRequestNoBody("GET","/something");
    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, such as the value sent by the server in the
    // Sec-WebSocket-Accept header. 
    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.
    // (At this point, we're done with the rest and socket objects...)

    console.log("Success.");

}

chilkatExample();

 

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