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Web

Introduction
What is Internet?

» Internet is a huge network of networks
» It connects computers together on global scale, forming
  a network in which any computer can communicate with
  any other computer as long as both computers are
  connected to the internet
What is web?

» World wide web (www) is simply termed as web
» Web is a way of accessing information over the internet
» It is an information sharing model built on top of the
  internet
Web Data
» Web uses http protocol to transmit data
» Http stands for Hyper Text Transfer Protocol, a language made for
  the internet communication
» Data is presented in the form of webpage, these webpages are
  stored in a server systerm
» A webserver is an application in the server which listens for requests
  from the web clients
» When webserver receives a request for a webpage, it transmits the
  webpage back to the web client as response.
» Web clients used are browsers such as Internet Explorer, Firefox
  and Google Chrome
» Webpages are linked to each other using hyperlinks, it can also
  include graphics, audio and video
Web protocol
» Browsers are used to browse through webpages in the web
» A URL, which stands for Uniform Resource Locator, is the address
  where the webpage is located
» A address is in the format: protocol://server/request-URI,
   ex: http://www.google.com/index.html
» The protocol part describes how to tell the server which document
  you want and how to retrieve it. The server part tells the browser
  which server to contact, and the request-URI is the name used by
  the web server to identify the document
» Index.html is the webpage that was requested by the web client user
  and which will be retrieved by the webserver and sent as response
  to browser. Browser will then display the webpage.
Resources
» http://www.garshol.priv.no/download/text/http-tut.html
» http://www.centerspan.org/tutorial/www.htm

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Web

  • 2. What is Internet? » Internet is a huge network of networks » It connects computers together on global scale, forming a network in which any computer can communicate with any other computer as long as both computers are connected to the internet
  • 3. What is web? » World wide web (www) is simply termed as web » Web is a way of accessing information over the internet » It is an information sharing model built on top of the internet
  • 4.
  • 5. Web Data » Web uses http protocol to transmit data » Http stands for Hyper Text Transfer Protocol, a language made for the internet communication » Data is presented in the form of webpage, these webpages are stored in a server systerm » A webserver is an application in the server which listens for requests from the web clients » When webserver receives a request for a webpage, it transmits the webpage back to the web client as response. » Web clients used are browsers such as Internet Explorer, Firefox and Google Chrome » Webpages are linked to each other using hyperlinks, it can also include graphics, audio and video
  • 6. Web protocol » Browsers are used to browse through webpages in the web » A URL, which stands for Uniform Resource Locator, is the address where the webpage is located » A address is in the format: protocol://server/request-URI, ex: http://www.google.com/index.html » The protocol part describes how to tell the server which document you want and how to retrieve it. The server part tells the browser which server to contact, and the request-URI is the name used by the web server to identify the document » Index.html is the webpage that was requested by the web client user and which will be retrieved by the webserver and sent as response to browser. Browser will then display the webpage.