why set response headers express code example

Example 1: set headers in express

response.header("Access-Control-Allow-Origin", "*");
    response.header("Access-Control-Allow-Headers", "Origin, X-Requested-With,Content-Type, Accept");
    response.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE')

Example 2: http header express

app.get('/', (req, res) => {
  req.header('User-Agent')
})
// Use the Request.header() method to access
//one individual request header’s value

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