Use express to not respond to specific browser requests #5069

johann1301s · 2022-12-17T21:16:14Z

johann1301s
Dec 17, 2022

I would like to serve some HTML based on a normal browser GET request. But I would like to respond with nothing at all, (as though the domain is not even registered) if the user-agent request header contains the string from the js variable myString.

I think this means that my server must not respond with status 100. But how is this done?

I tried just adding a return statement, which just left the request hanging. I also tried adding res.status(404).end() and res.destroy(), but the result in the browser is different than no response at all.

How can I 'not-respond' to a browser request for a specific user-agent, but otherwise respond normally?

const express = require('express')
const app = express()
const port = 3000

app.get('/', (req, res) => {
  const userAgent = req.headers['user-agent']
  const myString = 'firefox'
  if (userAgent.toLowerCase().includes(myString)) {
    res.destroy()
    return
  }
  res.setHeader("Content-Type", "text/html")
  res.send('<html><body>hello</body></html>')
})

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`)
})

I expected no visible result in the browser at all, as though the domain was not registered.

GroophyLifefor · 2023-07-08T08:13:48Z

GroophyLifefor
Jul 8, 2023

You can try res.end() method than destroy and do not remove return.

0 replies

joeyguerra · 2023-12-05T15:41:30Z

joeyguerra
Dec 5, 2023

I don't believe you can "not respond" to the request if the domain name resolves and the request is forwarded to your service.

0 replies

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Use express to not respond to specific browser requests #5069

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johann1301s Dec 17, 2022

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GroophyLifefor Jul 8, 2023

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joeyguerra Dec 5, 2023

johann1301s
Dec 17, 2022

GroophyLifefor
Jul 8, 2023

joeyguerra
Dec 5, 2023