Better error handling

app.js

@@ -3,13 +3,19 @@ const { Resolver } = require('dns').promises
 
 const app = express()
 const r = new Resolver()
+r.setServers(['1.1.1.1'])
 
 app.get('/', async (req, res) => {
   res.header('Content-type: text/plain')
-  const ip = req.connection.remoteAddress
-  let host
+  let ip, host
   try {
-    host = await r.reverse(/.*:([^:]+)$/.exec(ip)[1])
+    ip = /.*:([^:]+)$/.exec(req.connection.remoteAddress)[1]
+  } catch(err) {
+    console.log(err.message)
+    ip = 'ERR'
+  }
+  try {
+    host = await r.reverse(ip)
   } catch(err) {
     console.log(err.message)
     host = 'ERR'