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var app = express();

app.use(function (req, res, next) {
  res.setHeader('Access-Control-Allow-Origin', req.headers.origin);
  res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
  res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');
  next();
});