Express presents three major objects that you\'ll frequently use. List those thr

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Express presents three major objects that you'll frequently use. List those three objects and what they do. Chapter 3 pages 52 to 54.

Building an Express Web Application This new code should also be familiar to you because it resembles the code you used in the previous Connect example. This is because Express wraps the Connect module in several ways. The app.use) method is used to mount a middleware function, which will respond to any HTTP request made to the root path. Inside the middleware function, the res.status method is then used to set the HTTP response code, and the res.send) method is used to send the response back. The res.send0 method is basically an Express wrapper that sets the Content-Type header according to the response object type and then sends a response back using the Connect res.endmethod. When passing a buffer to the reas.send ) method, the Content-Type header will be set to application/octet-stream; when passing a string, it will be set to text/html; and when passing an object or an array, it will be set to application/json. To run your application, simply execute the following command in your command-line tool: s node server Congratulations! You have just created your first Express application. You can test it by visiting http://localhost:3000 in your browser The application, request, and response objects Express presents three major objects that you'll frequently use. The application object is the instance of an Express application you created in the first example and is usually used to configure your application. The request object is a wrapper of Node's HTTP request object and is used to extract information about the currently handled HTTP request. The response object is a wrapper of Node's HTTP response object and is used to set the response data and headers. The application object The application object contains the following methods to help you configure your application: .app.set (name, value):This is a method used to set environment variables that Express will use in its configuration. app.get (name): This is a method used to get environment variables that Express is using in its configuration. 52

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Q1) Express presents three major objects that you'll frequently use. List those three objects and what they do?

The 3 major objects are:-

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