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var express = require('express');
var app = express();

app.disable('x-powered-by');   // disable X-Powered-By header

app.use(function(req, res, next){
  res.header('X-XSS-Protection', '1; mode=block');
  res.header('X-Frame-Options', 'deny');
  res.header('X-Content-Type-Options', 'nosniff');
  next();
});