View difference between Paste ID: vZfEfk8r and UeBvdPMs

 var http = require('http');
 var url = require('url');
 var winston = require('winston');
 var logger = new (winston.Logger)({
     transports: [
       new (winston.transports.Console)(),
       new (winston.transports.File)({ filename: 'proxy.log', json: false })
     ]
   });
 var base_url;
 
 http.createServer(function (clientRequest, clientResponse) {
   logger.info('ENTERING createServer');
 
   function makeProxyRequest(clientRequestUrl) {
     logger.info('ENTERING makeProxyRequest');
 
     // hack!
     clientRequestUrl.protocol = 'http:';
 
 	if (typeof(clientRequestUrl.hostname) === "undefined") {
 	  clientRequestUrl.hostname = base_url.hostname;
 	}
 
     logger.info('client url: ' + url.format(clientRequestUrl));
 
     proxy = http.request(clientRequestUrl, proxyResponseHandler);
     proxy.on('error', function(e) {
 	  logger.error('problem with proxy request to '
                     + clientRequestUrl.host + '/' + clientRequestUrl.path
                     + ': ' + JSON.stringify(e));
       clientResponse.end();
     });
     proxy.end();
     logger.info('EXITING makeProxyRequest');
   }
 
   function proxyResponseHandler(proxyResponse) {
     logger.info('ENTERING proxyResponseHandler');
     logger.info('status: ' + proxyResponse.statusCode);
 
     switch(proxyResponse.statusCode) {
 	  case 301:
 	  case 302:
 		var new_url = url.parse(proxyResponse.headers['location']);
 		if(typeof(new_url.host) !== 'undefined') {
 		  base_url = new_url;
 		}
 		logger.info('redirect received: ' + JSON.stringify(new_url));
 		makeProxyRequest(new_url);
 	  break;
 
       case 200:
 	    for(header in proxyResponse.headers) {
           logger.info('	' + header + ': ' + proxyResponse.headers[header]);
           clientResponse.setHeader(header, proxyResponse.headers[header]);
         }
 
         clientResponse.writeHead(proxyResponse.statusCode);
 
         proxyResponse.on('data', function(data) {
           clientResponse.write(data);
         });
         proxyResponse.on('end', function() {
           logger.info('end from origin');
           clientResponse.end();
         });
 	  break;
 	}
     logger.info('EXITING proxyResponseHandler');
   }
   //////////////////////// Execution starts here //////////////////////////////
   var tmp_url = url.parse(clientRequest.url.substring(1));
   logger.info(JSON.stringify(tmp_url));
   logger.info(tmp_url.host);
   if (typeof(tmp_url.host) !== 'undefined' && typeof(base_url) === 'undefined' ) {
     base_url = tmp_url;
   }
   makeProxyRequest(tmp_url);
 
   logger.info('EXITING createServer');
 }).listen(8124);
 
 console.log('Server running at http://127.0.0.1:8124/');