proxy servrer(response image converted base64 encoding)

gistfile1.js

app.get('/proxy', function(req,res){
   var url, proxyReq, proxyRequest;

   if (req.param('url')) {
      url = require('url').parse(req.param('url'));
      options = {
         host: url.hostname,
         port: '80',
         path: url.pathname,
         method: 'GET'
      }

      proxyReq = http.request(options,function(proxyResponse){
         proxyResponse.setEncoding('binary');
         var type = proxyResponse.headers['content-type'],
         prefix = 'data:' + type + ';base64,',
         body = '',
         success = true;

         proxyResponse.on('data', function(chunk) {
            if (proxyResponse.statusCode === 200) {
               body += chunk;
            } else {
               res.statusCode = proxyResponse.statusCode;
               body += chunk;
               success = false;
            }
         });

         proxyResponse.on('end', function() {
            if (success) {
               var base64 = new Buffer(body, 'binary').toString('base64'),
                  data = prefix + base64,
                  obj = {
                     "src": url.href,
                     "data": data
                  };

               res.contentType('application/json');
               res.header("Access-Control-Allow-Origin", "*");
               res.header("Access-Control-Allow-Headers", "X-Requested-With");
               res.header("Access-Control-Allow-Methods", "GET,POST");

               res.send(JSON.stringify(obj));
            } else {
               res.send(body);
            }
         });

      });
      proxyReq.on('error', function(err) {
         console.log('error occ');
         res.statusCode = 404;
         res.send(err.message);
      });
      proxyReq.write('data\n');
      proxyReq.write('data\n');
      proxyReq.end();
   }else{
      res.statusCode=404;
      res.send(err.message);
   }
});