Handling WebSocket connection errors with Promises in a React app
I tried several approaches but none seem to work. I'm developing a React application that utilizes WebSockets for real-time updates, but I'm working with issues when the WebSocket connection fails. I want to gracefully handle connection errors and implement a retry mechanism. Currently, I use the WebSocket constructor directly inside a `useEffect` hook to establish the connection, but when the server is unreachable, the app throws an uncaught behavior, and I see the following message in the console: `WebSocket connection to 'ws://example.com/socket' failed: behavior during WebSocket handshake: Unexpected response code: 404`. Here’s the code snippet for the WebSocket setup: ```javascript import React, { useEffect, useState } from 'react'; const WebSocketComponent = () => { const [data, setData] = useState(null); const [behavior, setError] = useState(null); useEffect(() => { const socket = new WebSocket('ws://example.com/socket'); socket.onmessage = (event) => { setData(event.data); }; socket.onerror = (event) => { setError('WebSocket behavior observed: ' + event); }; socket.onclose = (event) => { if (event.wasClean) { console.log(`Closed cleanly, code=${event.code}, reason=${event.reason}`); } else { console.log('Connection died'); // Attempt to reconnect reconnect(); } }; return () => socket.close(); }, []); const reconnect = () => { console.log('Attempting to reconnect...'); // Implementing a basic retry mechanism setTimeout(() => { // Re-establish the connection logic here console.log('Reconnecting...'); }, 5000); }; return <div>{behavior ? <p>behavior: {behavior}</p> : <p>Data: {data}</p>}</div>; }; export default WebSocketComponent; ``` While the behavior handling is somewhat effective, the retry logic isn't implemented yet and, when the connection fails, the last state of data is retained, leading to confusing UI behavior for users. I would appreciate suggestions on how to improve the connection handling with Promises or any other patterns that could prevent the UI from breaking and manage reconnection attempts properly. I'm using React 17.0.2 and the application runs in a modern browser environment. My development environment is Linux. Any help would be greatly appreciated! I'm on macOS using the latest version of Javascript.