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Lesson 5. Passing Data Between Pages > Understanding the HTTP Protocol

Understanding the HTTP Protocol

Pages on the Web are transferred using the HTTP protocol. This protocol specifies how users (or, in some cases, systems) make requests of servers over the World Wide Web, and how these servers respond to these requests. Understanding the basics of this protocol will help you understand how dynamic pages work.

At its core, the HTTP protocol is a transactional system. A client sends a request to a server, and the server sends a response back to the client. Most developers at this point understand the basics of the system. One part of the request is the URL, or Uniform Resource Locator. When you click a link in a browser, a request is sent to the server that contains the desired file.


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