Handling Rate Limiting in Node.js with Express and Redis - Unexpected Lockout Behavior
After trying multiple solutions online, I still can't figure this out. I've spent hours debugging this and I'm implementing a rate limiting feature in my Node.js application using Express and Redis to throttle requests to certain routes... I followed the steps in the `express-rate-limit` documentation and configured it to limit requests to 100 per 15 minutes for a specific endpoint. However, I'm noticing that users are getting locked out even when they haven't exceeded the limit. Here's how I'm trying to set it up: ```javascript const express = require('express'); const rateLimit = require('express-rate-limit'); const RedisStore = require('rate-limit-redis'); const redisClient = require('redis').createClient(); const app = express(); const limiter = rateLimit({ store: new RedisStore({ client: redisClient, expiry: 900 }), windowMs: 15 * 60 * 1000, max: 100, keyGenerator: (req, res) => req.ip, message: 'Too many requests from this IP, please try again later.' }); app.use('/api/', limiter); app.get('/api/data', (req, res) => { res.send('Here is your data!'); }); app.listen(3000, () => { console.log('Server is running on port 3000'); }); ``` I verified that the Redis configuration is correct and that the Redis server is running properly. However, when testing with multiple requests from the same IP, I found that the first few requests go through, but after hitting the limit, subsequent requests get a `429 Too Many Requests` response even when they should still be within the limit. I also checked the Redis database and the rate limit keys seem to expire correctly, yet users get locked out for longer than expected. I’ve tried adjusting the `windowMs` to a shorter period and varied the `max` limit, but the unexpected lockout behavior persists. What could be causing this issue, and how can I ensure that the rate limiting works as intended without prematurely locking out users? Any feedback is welcome! This is for a REST API running on Ubuntu 20.04. What's the correct way to implement this?