Rule Definition
When designing the routing system of the server, you have to make sure you have only one routing handler per path. Duplicating handler will affect the global performance of the server creating latency issues.

Remediation
Ensure you only have one routing handler per path.

Violation Code Sample

// multiple handler for the same path /foo 
var express = require('express'); 
var app = express(); 
app.get('/foo', function (req, res) { 
   res.send('hi'); 
}); 
// add a second foo route handler 
app.get('/foo', function (req, res) { 
   res.send('hi2'); 
}); 

// call in a loop for the same path /foo 

for (i = 0; i < paths.length; i++) { 

   app.get('/foo', function (req, res) { 
      res.send('hi ' + paths[i]); 
   }); 
} 

console.log('stack', app._router.stack); 
app.listen(3000);

Fixed Code Sample

// multiple handler for the same path /foo 
var express = require('express'); 
var app = express(); 
app.get('/foo', function (req, res) { 
   res.send('hi'); 
}); 
// add a second foo route handler 
app.get('/foo2', function (req, res) { 
   res.send('hi2'); 
}); 

// call in a loop for different paths 

for (i = 0; i < paths.length; i++) { 

   app.get('/foo'+paths[i], function (req, res) { 
      res.send('hi ' + paths[i]); 
   }); 
} 

console.log('stack', app._router.stack); 
app.listen(3000);

CISQ Recommendation: ASCPEM-PRF-08 http://techblog.netflix.com/2014/11/nodejs-in-flames.html