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Let's start with the an overview of the basics. When you go to a web page, say, cnn.com , there is a lot going on behind the scenes to make that page show up in your browser. Remember, before anything can happen, a TCP/IP connection is established between your computer and the cnn.com webserver through port 80. Your browser will then start requesting "assets" to build the page. Some of these assets include HTML, CSS, Javascript and Image files, etc. They allow the browser to render the web page visible to you.

The Webserver and your browser talk to each other in a protocol called HTTP (over TCP/IP). The two most common ways of communicating over HTTP are GET and POST. Without going into the gory technical details, the difference between a "GET" and a "POST" is that the "GET" method passes form data on the URL which is visible in the browser location window. In the POST method, the form data is sent along with the body of the request and is not visible in the URL. The following is an example of HTTP communication showing a GET request for the cnn.com logo which was sent to the Webserver by my browser.

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