Handling Memory Leaks When Using WebSocket in React with cleanup
I'm testing a new approach and Hey everyone, I'm running into an issue that's driving me crazy. I've been implementing a WebSocket connection in my React application to receive real-time updates, but I'm running into some serious performance optimization. After navigating through different components, it seems like the WebSocket connections are not closing properly, leading to memory leaks. I'm using React 17.0.2 and the `useEffect` hook to manage the WebSocket lifecycle. My current implementation looks like this: ```javascript import React, { useEffect, useState } from 'react'; const WebSocketComponent = () => { const [messages, setMessages] = useState([]); useEffect(() => { const socket = new WebSocket('wss://example.com/socket'); socket.onmessage = (event) => { const newMessage = JSON.parse(event.data); setMessages(prev => [...prev, newMessage]); }; // Here I'm trying to clean up the socket connection return () => { socket.close(); }; }, []); return <div>{messages.map(msg => <div key={msg.id}>{msg.content}</div>)}</div>; }; ``` However, despite the cleanup function in `useEffect`, I noticed that if I navigate away from the component, the memory usage keeps increasing in the performance tab of my browser. I also checked the Network tab, and it seems like there are still open connections after leaving the component. I tried adding a console log in the cleanup function, and it seems to be executed, but the connections are still lingering. I've verified that the URL is correct and no other part of the application is creating additional WebSocket connections. Are there any common pitfalls I might be missing when using WebSockets in React, or any patterns I can follow to ensure that connections are properly managed? The errors I see in the console indicate `WebSocket is already in CLOSING or CLOSED state` when I try to send a message after navigating back to the component. Any insights would be greatly appreciated! What's the best practice here? Could this be a known issue? I'm working with Javascript in a Docker container on Ubuntu 20.04. Thanks in advance!