WWW: World Wide Web → The Web

  • Provides access to information, to linked resources distributed at many hosts
  • Allows:
    • Receive (and publish) information
    • “Navigate through an ocean” of information via hyperlinks, and the interaction of different Web pages
  • Operates:
    • On demand
      • Users receive and publish “what they want” “when they want”
    • Client-Service Model
  • Elements of the web architecture
    • Pages
      • HTML, hypertext, hyperlinks
    • Objects
      • Can reside at the same or another host
    • Addressing
      • URL: Uniform Resource Locator
    • Functional Entities
      • Web Client (Navigator)
      • Web server
    • HTTP Protocol
  • Addressing
    • With a URL: Universal Resource Locator
      • Element for addressing resources
    • URL parameters
      1. Service identifier (protocol)
      2. Domain name of Server Host
      3. Path to access object
      4. Object name
    • URL syntax
      • Characters “://” separate first parameter from second one
      • Character “/” used to separate the rest of parameters
Picture showing a screenshot of a web browser and a URL
  • Web Client (Browser)
    • Includes:
      • User agent
        • Software that provides an interface between the user and Web application
        • Captures and visualizes pages and allows navigation through their contents
        • Diverse configuration characteristics
      • HTTP Client
        • Communication software that implements the HTTP Client part
      • Best known browsers:
        • Chrome
        • MS Internet Explorer / Edge
        • Firefox
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