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This chapter is from the book


  • Web systems are hypertext document systems that are relatively new to the computing world.

  • The fundamental elements of a Web system are the client browser, the network, and a Web server.

  • A Web application is a Web system that delivers business logic.

  • HTTP is the primary protocol for communication between clients and servers.

  • HTTP is a connectionless protocol. Each time a client requests a document from a Web server, a new connection must be established with the server.

  • As identifiers of network resources, URLs or URIs can reference Web pages, images, applets, and other resources on the network.

  • Web pages are documents that are requested by the client and delivered by the Web server.

  • The principal formatting language for Web pages is HTML. It tells the browser how to render the content on the screen.

  • Forms allow users to enter input through a Web page.

  • Frames allow multiple Web pages to be active for a user at the same time.

  • Session management is the tracking of a particular user's progress through the application, even across Web pages. Cookies can be used to help manage client state on the server.

  • Enabling technologies are development environments that provide the infrastructure for building Web applications.Some popular technologies are CGI, Active Server Pages, JavaServer Pages, servlets, and Web server APIs.

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