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The Hypertext Transfer Protocol (HTTP) began as an extremely basic protocol, designed to do just one thing: allow a client to send a simple request for a hypertext file and receive it back from the server. Modern HTTP remains at its heart a straightforward request/reply protocol, but now includes many new features and capabilities to support the growing size of the World Wide Web (the Web) and the ever-increasing variety of ways that people have found to use the Web. Therefore, the best place to start explaining HTTP is by looking at its operation as a whole and how communication takes place between ...

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