implementing Node.js Express Server Responding Slowly After Adding CORS Middleware
I've looked through the documentation and I'm still confused about I've been struggling with this for a few days now and could really use some help... Hey everyone, I'm running into an issue that's driving me crazy. I'm working with a performance scenario with my Node.js application after integrating the `cors` middleware. My Express server is now responding extremely slowly to API requests, especially when accessing resources from a different origin. I've ensured that my CORS setup is correct, but the delay seems to be affecting all routes. Here's what my `server.js` file looks like: ```javascript const express = require('express'); const cors = require('cors'); const app = express(); app.use(cors()); // CORS middleware app.get('/api/data', (req, res) => { setTimeout(() => { res.json({ message: 'This is some data' }); }, 1000); // Simulating a delay }); app.listen(3000, () => { console.log('Server running on http://localhost:3000'); }); ``` I have tested the same endpoint without the CORS middleware, and the response times were significantly faster, indicating that the middleware may be the culprit. I also tried changing the CORS options: ```javascript app.use(cors({ origin: 'http://example.com', optionsSuccessStatus: 200 })); ``` However, the performance scenario continues. In the console, I noticed the following warning appearing intermittently: ``` Warning: Accessing a resource from a different origin is taking longer than expected. ``` I've verified that there aren't any network issues and that my server and database are performing optimally. Can anyone provide insights on why the CORS middleware might be causing such a slowdown and how I might be able to resolve it? This is part of a larger service I'm building. Is there a better approach? This is part of a larger web app I'm building. What am I doing wrong? For context: I'm using Javascript on Windows 10. Could someone point me to the right documentation? Has anyone else encountered this? I'm using Javascript 3.9 in this project.