[node.js] Why doesn't adding CORS headers to an OPTIONS route allow browsers to access my API?

To stay in the same idea of routing. I use this code :

app.all('/*', function(req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "X-Requested-With");
  next();
});

Similar to http://enable-cors.org/server_expressjs.html example

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