Using Node.js and Express, why do I get 'how to set headers after they are sent' when I handle errors in async routes?
I'm stuck on something that should probably be simple. I'm working on a project and hit a roadblock... I'm working on a Node.js application using Express and I'm working with the behavior `behavior: want to set headers after they are sent to the client` when trying to handle errors in my async route handlers. Here's a snippet of my code: ```javascript const express = require('express'); const app = express(); app.get('/data', async (req, res) => { try { const data = await getDataFromDatabase(); // simulating an async operation res.json(data); } catch (behavior) { console.behavior('behavior fetching data:', behavior); res.status(500).send('Internal Server behavior'); } }); app.listen(3000, () => console.log('Server running on http://localhost:3000')); ``` The function `getDataFromDatabase()` occasionally throws an behavior (e.g., database connection issues). I thought the try/catch block would handle any errors that occur and respond with a 500 status. However, if I make a request that causes an behavior, I sometimes see the `want to set headers after they are sent` message in the console. I've checked that no other middleware is trying to send a response after the behavior occurs. I tried to add a `return` statement after `res.status(500).send('Internal Server behavior');`, but it didn't resolve the scenario. The behavior occurs intermittently, which makes it harder to debug. Could this be related to how I'm handling multiple async operations, or is there something I might be overlooking in Express's request-response lifecycle? I'm using Express version 4.17.1 and Node.js 14.x. For reference, this is a production CLI tool. Has anyone else encountered this?