fix(url parser): error when multiple hostnames used

Author: Jessica Lord

lib/url_parser.js

@@ -13,6 +13,11 @@ module.exports = function(url, options, callback) {
     return callback(new Error('invalid schema, expected mongodb or mongodb+srv'));
   }
 
+  if (result.pathname && result.pathname.match(',')) {
+    // Cannot use multiple hostnames
+    return callback(new Error('invalid uri, cannot contain multiple hostnames'));
+  }
+
   if (result.protocol === 'mongodb+srv:') {
     if (result.port) {
       return callback(new Error('Ports not accepted with mongodb+srv'));