Unable to establish Websocket Connection Selenium

Know here why I am unable to establish Websocket Connection Selenium, and learn How to Establish WebSocket Connection in some simple steps, take a look!

by Janani | Updated Mar 31, 2023

Unable to establish Websocket Connection Selenium

What is unable to establish Websocket Connection Selenium?

The “WebSocket unable to connect” error message is the error message that occurs when you work behind a proxy that doesn't support the WebSocket protocol. In this case, the device connections will switch to the HTTP protocol. WebSockets is a communication protocol for computer networks that enables bidirectional data transmission over a single TCP connection. The IETF standardized the WebSocket protocol in 2011 under RFC 6455. The current specification for the WebSockets API, which permits web applications to utilize this protocol, is referred to as WebSockets.

How to establish Websocket Connection?

You must first call the WebSocket constructor and pass in the URL of your server.

The codes given below are used to create a Web Socket connection −

// Create a new WebSocket.

var socket = new WebSocket('ws://echo.websocket.org');

After the connection has been established, the open event will be launched on your Web Socket instance.

Alternative Method to Establish WebSocket Connection

To establish a WebSocket connection, you can follow these general steps:

Create a WebSocket object: In most programming languages, you can create a WebSocket object that will handle the connection. For example, in JavaScript, you can create a new WebSocket object by providing the URL of the server you want to connect to.

Open the WebSocket connection: Once you have created the WebSocket object, you can call its "open" method to start the connection.

Handle the connection events: WebSocket connections have several events that can occur, such as "open", "close", "error", and "message". You can handle these events to react appropriately to the state of the connection.

Send and receive messages: After the connection is established, you can send and receive messages using the WebSocket object's "send" and "onmessage" methods, respectively.

Here is an example of how to establish a WebSocket connection in JavaScript:


Copy code

// Create a new WebSocket object

const socket = new WebSocket('wss://example.com');

// Open the WebSocket connection

socket.addEventListener('open', function (event) {

  console.log('WebSocket connection opened');


// Handle WebSocket errors

socket.addEventListener('error', function (event) {

  console.error('WebSocket error:', event);


// Handle WebSocket messages

socket.addEventListener('message', function (event) {

  console.log('WebSocket message received:', event.data);


// Send a message over the WebSocket connection

socket.send('Hello, server!');

Note that the URL passed to the WebSocket constructor should include the "ws://" or "wss://" protocol, depending on whether you want to establish an unsecured or secured connection, respectively.

How to verify Websocket Connection Status?

You could verify if a WebSocket is connected by performing either of the following:

1) Mentioning a function to the WebSocket.onopen event handler property.;

2) With the help of the addEventListener hear to the open event.

For example, you will use the event handler property like so:

const ws = new WebSocket('ws://localhost:8080');

ws.onopen = function (event) {



Or, you could use an alternative, you could use addEventListener (to listen to the open event) like so:

const ws = new WebSocket('ws://localhost:8080');

ws.addEventListener('open', function (event) {



The open event is launched when the connection with a WebSocket is opened. When this happens, the readyState of the WebSocket connection transforms to OPEN.

Alternative Method to Verify Websocket Connection Status

To verify the status of a WebSocket connection, you can use the readyState property of the WebSocket object. The readyState property indicates the current state of the WebSocket connection and can have the following values:

0: The WebSocket connection has not yet been established.

1: The WebSocket connection is established and ready to communicate.

2: The WebSocket connection is in the process of closing.

3: The WebSocket connection has been closed or could not be opened.

To check the WebSocket connection status, you can use a setInterval function to periodically check the readyState property. Here is an example of how to do this in JavaScript:


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const socket = new WebSocket('wss://example.com');

// Check the WebSocket connection status every 5 seconds

const interval = setInterval(function() {

  switch (socket.readyState) {

    case WebSocket.CONNECTING:

      console.log('WebSocket is connecting');


    case WebSocket.OPEN:

      console.log('WebSocket is open');


    case WebSocket.CLOSING:

      console.log('WebSocket is closing');


    case WebSocket.CLOSED:

      console.log('WebSocket is closed');




      console.error('Unknown WebSocket readyState:', socket.readyState);



}, 5000);

This code creates a WebSocket object and then uses setInterval to check the readyState property every 5 seconds. The switch statement inside the setInterval function checks the value of the readyState property and logs a message indicating the current status of the WebSocket connection. If the connection is closed, the clearInterval function is called to stop the interval from running.

Note: The above given tutorial steps are for reference purpose only, users can try the steps and check if they work or not. We do not guarantee the working of the steps.

Disclaimer: The above information is for general informational purposes only. All information on the Site is provided in good faith, however we make no representation or warranty of any kind, express or implied, regarding the accuracy, adequacy, validity, reliability, availability or completeness of any information on the Site.

Unable to Establish Websocket Connection Selenium - FAQs

1. What is WebSocket?

WebSocket is a computer communications protocol, that provides full-duplex communication channels over a single TCP connection. 

2. When was WebSocket?

The WebSocket protocol was standardized by the IETF as RFC 6455 in 2011.

3. Who developed WebSocket?

IETF  developed WebSocket.

4. What is the connector type of WebSocket?

TCP is the connector type of WebSocket.

5. What does WebSocket protocol specification define?

The WebSocket protocol specification defines ws (WebSocket) and wss (WebSocket Secure) as two new uniform resource identifier (URI) schemes.

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