NodeJS http module: what is requestListener?
The docs say that the method call takes a function which will be called when a new request is received by your application. This function, as you correctly stated in your question, takes two arguments - a request
and response
objects.
You should inspect the contents of these objects to learn what information is available to you. Also, take a look at the API docs for request and response.
The function is optional; you could also attach the request handler in the following way:
var server = http.createServer()
server.on('request', function (req, res) {
// Process the request here
})
In practice, this function is called when someone opens up your website in their browser (i.e. issues a GET http request). The purpose of that function is to provide a HTTP response body back to the client, i.e. render a web page or perform any business logic as necessary.