Express.js - Unexpected Behavior with Response Caching on Static Assets Using Express-Static
I'm stuck trying to I'm testing a new approach and Hey everyone, I'm running into an issue that's driving me crazy... I am experiencing unexpected behavior with response caching when serving static assets in my Express.js application using `express-static`. I have configured my middleware to serve static files from a `public` directory, but the caching headers seem to be inconsistent across different files. For example, I have the following setup: ```javascript const express = require('express'); const path = require('path'); const app = express(); const PORT = process.env.PORT || 3000; app.use(express.static(path.join(__dirname, 'public'), { setHeaders: (res, file) => { if (file.endsWith('.js')) { res.set('Cache-Control', 'public, max-age=31536000'); // 1 year } else { res.set('Cache-Control', 'no-cache'); } } })); app.listen(PORT, () => { console.log(`Server is running on http://localhost:${PORT}`); }); ``` In this setup, I expect all `.js` files to be cached for one year, while other file types are not cached at all. However, when I check the network tab in Chrome's dev tools, I notice that some `.js` files are being served with `Cache-Control: no-store`. I have also tried clearing my browser cache and restarting the server, but the behavior persists. I am running Express version 4.17.1. I have verified that the files are indeed in the `public` directory. Additionally, I checked if there are any other middleware affecting the headers, but it seems like there isn’t. Could there be a specific reason why some files are not picking up the caching headers correctly? Any help would be greatly appreciated! My development environment is Ubuntu 22.04. I'm developing on Ubuntu 20.04 with Javascript. Any pointers in the right direction? The project is a application built with Javascript. Any help would be greatly appreciated!