NodeJS httpServer make REST calls based on querystring parameter

Has dependencies on request, which you could install using the npm command.
In the example below it is a simple web application listening on localhost port 8080.
If the employeeId querystring parameter is detected, regardless of the path, it will make a call to a  RESTful service to retrieve a (fictional) worker information... you get the idea.

 // Include the request library for Node.js. This is not part of native libary.    
 var request = require('request');  
 var http = require('http');  
 var url = require('url');  
 http.createServer(function (req, res) {  
   res.writeHead(200, {'Content-Type': 'text/html'});  
      res.write('Start querying<br />');  
      var u = url.parse(req.url, true);  
      var queryData = u.query;  
      if (queryData.employeeId) {  
           console.log('employeeId: ' + queryData.employeeId);  
           // Sample URL call: http://localhost:8080/anything?employeeId=999  
           // Basic Authentication credentials    
           var username = "username";   
           var password = "password";  
           var authenticationHeader = "Basic " + new Buffer(username + ":" + password).toString("base64");  
           request.get(    
           {  
                uri : "https://service.domain.com/WorkerSnapshot?$format=JSONP&EmployeeID=" + queryData.wwid,  
                rejectUnauthorized: false,  
                json: true, // indicates the returning data is JSON, no need for JSON.parse()  
                headers : { "Authorization" : authenticationHeader }   
           },  
           function (error, response, body) {  
                res.write(body);  
           }  
           );            
      }  
 }).listen(8080);