Describe the process of an HTTP exchange over a pair of sockets.
What will be an ideal response?
An HTTP exchange takes place over a pair of sockets. A socket is an abstract concept that represents a port at one end of a connection. For HTTP, sockets routinely are associated with port 80 on the client and server. Port 80 is open whenever you access the Web. Like any open port, it is a potential security weakness that a hacker could exploit.
In an HTTP exchange, your browser opens a socket on your PC, connects to a similar open socket at the Web server, and issues a command, such as send me an HTML document. The server receives the command, executes it, and sends a response back through the socket. The sockets are then closed until the browser is ready to issue another command. The Web page you see in your browser might consist of many text and graphic elements, each requiring a separate transfer. These are the files that build up in your browser cache.
Each HTTP exchange transmits one element of a Web page. When the sockets are closed, the server essentially forgets your previous requests. A cookie is a mechanism that helps a Web server remember your activities at the site. Cookies provide information about the pages that you've visited and items that you've loaded into your shopping cart.
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