Websockets request was expected

When making a websockets request, there are a few important elements to consider:

1. URL: The URL where the websocket server is running. This can be something like ws://example.com/socket.
2. Protocol: The protocol used for the websocket connection. This can be either ws:// for unencrypted connections or wss:// for encrypted connections.
3. Connection Establishment: To establish a websocket connection, the client sends a handshake request to the server. The server responds with a handshake response, and if successful, the connection is established.
4. Exchange of Messages: Once the connection is established, the client and server can exchange messages using the websocket protocol. The messages can be in any format, but they are typically sent as JSON strings.

Here’s an example of how to make a websocket request in JavaScript:

var socket = new WebSocket("ws://example.com/socket");

// Event listener for when the connection is established
socket.onopen = function(event) {
    console.log("Connection established");
    
    // Send a message to the server
    socket.send(JSON.stringify({message: "Hello server!"}));
};

// Event listener for receiving messages from the server
socket.onmessage = function(event) {
    var message = JSON.parse(event.data);
    console.log("Received message from server:", message);
    
    // Close the connection
    socket.close();
};

// Event listener for when the connection is closed
socket.onclose = function(event) {
    console.log("Connection closed");
};

In this example, we create a new WebSocket object with the URL of the websocket server. We then listen for several events including onopen (when the connection is established), onmessage (when a message is received), and onclose (when the connection is closed). We can send messages to the server using the send method, and close the connection using the close method.