How to Properly Handle Concurrent Requests with Node.js and Redis for Session Management?
I'm attempting to set up I'm sure I'm missing something obvious here, but I'm trying to implement This might be a silly question, but I've been banging my head against this for hours... I'm currently building a Node.js application using Express (v4.17.1) and I decided to implement Redis (v6.2.6) for session management to improve performance. However, I'm running into issues when multiple users try to log in simultaneously, leading to unexpected behavior. For example, sometimes user sessions seem to overwrite each other, resulting in users receiving incorrect session data. Here's a simplified version of my code where I'm setting and getting session data: ```javascript const express = require('express'); const session = require('express-session'); const RedisStore = require('connect-redis')(session); const redis = require('redis'); const app = express(); const redisClient = redis.createClient(); app.use(session({ store: new RedisStore({ client: redisClient }), secret: 'mySecret', resave: false, saveUninitialized: false, cookie: { secure: false } })); app.post('/login', (req, res) => { const { username } = req.body; req.session.username = username; res.send(`Logged in as ${username}`); }); app.get('/session', (req, res) => { res.send(`Session username: ${req.session.username}`); }); app.listen(3000, () => { console.log('Server running on port 3000'); }); ``` I've ensured that I am not using the same session ID for concurrent requests, and I verified that the Redis store is functioning correctly. However, during stress testing, using a tool like Apache Benchmark, I noticed that multiple requests at the same time can lead to a situation where one user's session seems to be returned to another user. I also see log messages in Redis indicating that sessions are being set and overwritten, but it’s unclear why this happens. Could this be an issue with the way the session is being stored or retrieved in a concurrent environment? How can I prevent this from happening, and ensure that sessions remain unique and properly scoped to each user? I'm working on a application that needs to handle this. What am I doing wrong? This is part of a larger CLI tool I'm building. What would be the recommended way to handle this? This issue appeared after updating to Javascript 3.9. Thanks in advance! This is part of a larger service I'm building. Any pointers in the right direction?