Unit 15.1. Using Cookies to Maintain State

Maintaining State in a Web Application

It can be difficult to grasp that each request is unrelated when surfing the Web. What happens when a browser requests a Web page or resource from a site? In short:

  • Browser identifies the server that has the resource

  • Browser requests the resource from the server

  • Server returns the resource to the browser for rendering

Although each request is separate, Web browsers create the feeling of a user session by placing each request for a page into a larger context; thus a Web browsing session can unfold like a story, with you as the protagonist and the sequence of pages you travel through as the plot. Browsers keep track of each page request, and provide “Previous” and ...

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