Internet server components
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The document discusses various topics related to web servers including their basic functions, components, common types of websites, client-server architectures, static vs dynamic content, server-side scripting technologies, request messages, and multi-tier architectures. It also covers operating system tasks and mentions Linux as an open-source operating system option.
Internet server components
- 2. Web server basics Software for Web servers E-mail management and spam control issues Internet and Web site utility programs Web server hardware 2
- 3. The main job of a Web server is to respond to requests from Web client computers There are 3 components of a Web server: ◦ Hardware ◦ Operating system software ◦ Web server software 3
- 4. Development sites: Used to evaluate different Web designs Intranets: Corporate networks that house internal memos, corporate policy handbooks, and a variety of other corporate documents Extranets: Intranets that allow authorized parties outside the company to access information stored in the system Transaction-processing sites: Commerce sites that must be available 24 hours a day, seven days a week Content-delivery sites: Deliver content such as news, histories, summaries, and other digital information 4
- 5. Client/server architectures ◦ Client computers request services ◦ A server processes the clients’ requests Web software is platform neutral, meaning that it lets different types of servers communicate with a variety of clients 5
- 6. Dynamic content is nonstatic information constructed in response to a Web client’s request ◦ Dynamic page: Web page whose content is shaped by a program in response to user requests ◦ Static page: An unchanging page retrieved from disk 6
- 7. Server-side scripting (or includes) ◦ Programs running on a Web server create Web pages before sending them back to the requesting Web clients Dynamic page-generation technologies: Server side scripts are combined with html tags to create dynamic content ◦ Active Server Pages (ASP) ◦ JavaServer Pages (JSP) ◦ PHP: Hypertext Preprocessor (PHP) 7
- 8. Server ◦ Computer used to provide files or make programs available to other computers Server software: Used by a server to make files and programs available to other computers Database server: Server on which database management software runs 8
- 9. Two-tier client/server architecture has one client and one server 9
- 10. Request message: Message that a Web client sends to request a file or files from a Web server ◦ Typical request message contains: Request line Contains a command, the name of the target resource, and the protocol name and version number Request headers Can contain information about types of files that the client will accept in response to a request Entity body Used to pass bulk information to the server 10
- 11. Three-tier architecture ◦ Extends two-tier architecture to allow additional processing (e.g., collection of data from a database) before reponses to requests are made N-tier architectures ◦ Higher-order architectures ◦ Third tier includes software applications that interactively supply and update information to and from the web server 11
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- 13. Operating system tasks include running programs and allocating computer resources ◦ Open-source software: Developed by a community of programmers who make it available for download at no cost Linux: Open-source operating system that is easy to install, fast, and efficient 13