When a browser uses the HTTP protocol to load a filie or page from a server and display it in the browser, it is called the request/response cycle.
What is HTTP?
The Hypertext Transfer Protocol (HTTP) is an Internet protocol suite model application layer protocol for networked, collaborative, hypermedia information systems. HTTP is the World Wide Web's foundation for data exchange, where hypertext pages include hyperlinks to other resources that the user may readily access, for example, by a mouse click or by tapping the screen in a web browser. Tim Berners-Lee launched HTTP development at CERN in 1989, and it was described in a brief text detailing the behaviour of a client and a server using the initial HTTP protocol version, 0.9.
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