A testcase which can holds to 128* 100 connections parllely and matching the data chunk with a specified word and storing its word count in a file.

exp.js

var http = require('http');
var util = require('util');
var fs = require("fs");

var string = 'http://' + process.argv[2] + ':' + process.argv[3] + '/';


var out = fs.createWriteStream('./out.txt');
var start = process.hrtime();

function mapreduce(d){
        var result = d.toString().match(/node/g);
        if(result != null)
          out.write(result.length.toString() + '\n');

}


for(var count=0;count<process.argv[4];count++) {
  http.get(string, (res) => {
    res.on('data', (d) => {
     mapreduce(d);
   });

res.on('end', () => {
      repeat(99);
    });

  });
}

function repeat(index) {
  if(index == 0) return;
  http.get(string, (res) => {
    res.on('data', (d) => {
     mapreduce(d);
     });
    res.on('end', () => {
      repeat(index - 1);
    });
  });
}

process.on('exit', function() {
  var diff = process.hrtime(start);
  console.log(Math.round((diff[0] * 1e9 + diff[1]) / 1000000) + ' millis.');
});