Local Web Server + Proxy Relay

gistfile1.js

var sys = require("sys"),
http = require('http'),
path = require("path"),
url = require("url"),
filesys = require("fs");

http.createServer(function(request, response) {
  
  var my_path = url.parse(request.url).pathname;
  var full_path = path.join(process.cwd(),my_path);
  path.exists(full_path,function(exists){
    if(!exists){
      var proxy_request = http.request({ 
        host: "en.wikipedia.org",
        port: 80,
        path: my_path,
        method: request.method
      }, function(proxy_response) {
        proxy_response.addListener('data', function(chunk) {
          response.write(chunk, 'binary');
        });
        proxy_response.addListener('end', function() {
          response.end();
        });
        response.writeHead(proxy_response.statusCode, proxy_response.headers);
      });

      request.addListener('data', function(chunk) {
        proxy_request.write(chunk, 'binary');
      });
      request.addListener('end', function() {
        proxy_request.end();
      });
    }
    else{
      filesys.readFile(full_path, "binary", function(err, file) {  
           if(err) {  
               response.writeHeader(500, {"Content-Type": "text/plain"});  
               response.write(err + "\n");  
               response.end();  
         
           }  
         else{
          response.writeHeader(200);  
              response.write(file, "binary");  
              response.end();
        }
           
      });
    }
  });
  
}).listen(8080);