The middleware function takes the following arguments:
The request object: This is a wrapper on top of the request parameter found in Node's
http.createServerfunction, with added functionalitiesThe response object: This is another wrapper that extends the response parameter found in Node's
http.createServerfunctionA callback: This is usually named
next, which might get executed when everything in the current middleware is done so that the following middleware in the stack can be invoked
The following is an example of a middleware that only allows the web application to be accessed by users that are inside the private network, based on their IP address. If a user has access, we will call the next function; otherwise, we will display an error message and send the error status code (403 in this case).
function restrictAccess(req, res, next) {
var ip = req.ip;
// check if the ip belongs to the server
// or to a user in the local network
// meaning his...