A little server that I used to collect headers for https://keithamus.ghost.io/an-analysis-of-http-headers

collect-headers.js

var app = require('express')(),
    fs = require('fs');
var headers = [];
app.get('/', function (req, res) {
    headers.push(req.headers);
    res.json(req.headers);
});
setInterval(function () {
    fs.writeFileSync('headers.json', JSON.stringify(headers));
}, 10000);
require('http').createServer(app).listen(3000);