Docs: custom server and error handling

### What is the documentation issue? Hello, shouldn't there be some error handlers/listeners when we create a custom server? like ``` import { createServer } from 'http' import { parse } from 'url' import next from 'next' const port = parseInt(process.env.PORT || '3000', 10) const dev = process.env.NODE_ENV !== 'production' const app = next({ dev }) const handle = app.getRequestHandler() app.prepare().then(() => { createServer((req, res) => { const parsedUrl = parse(req.url!, true) handle(req, res, parsedUrl) }) .on("error", err => { logError(err); }) .listen(port) console.log( `> Server listening at http://localhost:${port} as ${ dev ? 'development' : process.env.NODE_ENV }` ) }) ``` And what about about the handler? It returns a Promise. Don't we need to handle the reject? Cheers ### Is there any context that might help us understand? My application has sometimes ECONNRESET errors. I don't know why yet. It becomes unresponsive and it needs to be rebooted. ### Does the docs page already exist? Please link to it. https://nextjs.org/docs/app/guides/custom-server