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Access HTTP headers values from a request
You can access all the HTTP headers using the Request.headers property:
app.get('/', (req, res) => {
console.log(req.headers)
})
Use the Request.header() method to access one individual request header’s value:
app.get('/', (req, res) => {
req.header('User-Agent')
})
Change any HTTP header value for a response
You can change any HTTP header value using Response.set():
res.set('Content-Type', 'text/html')
There is a shortcut for the Content-Type header, however:
res.type('.html')
// => 'text/html'
res.type('html')
// => 'text/html'
res.type('json')
// => 'application/json'
res.type('application/json')
// => 'application/json'
res.type('png')
// => image/png: