added dns resolve option

Author: gerhardcit

index.js

@@ -1,5 +1,6 @@
 const express = require('express');
 const mongodb = require('mongodb');
+const dns = require('dns');
 
 var app = express();
 
@@ -17,6 +18,17 @@ app.get('/connect-long', function (req, res) {
     connect(req, res, uri);
 });
 
+app.get('/dns', (req, res) => {
+    const hostname = req.query.hostname;
+    dns.resolveSrv(hostname, function (e, address) {
+        if (e) {
+            res.json(e);
+        } else {
+            res.json(address);
+        }
+    });
+})
+
 function connect(req, res, uri) {
     mongodb.connect(uri, { useNewUrlParser: true }, function (err, db) {
         if (err) {