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WebBasics - CSE 102 Introduction to Web Design and...

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CSE 102 Introduction to Web Design and Programming Web Basics
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Why is the Web such a success? It’s everywhere even North Korea It’s open thanks to the w3c It’s fast no more snail mail It’s cheap unless you’re into online gambling It’s simple well, not always, but making a simple, static Web page is
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What is the Web made of? Networks LANs and WANs connected to one another Local Area Network, Wide Area Network Clients Web browsers (ex: IE) Servers Machines/programs constantly running that serve information to the Web Documents Web pages in HTML, XHTML, XML, etc … Protocols standard communication formats for everyone, YAY!!! HTTP (Hypertext Transfer Protocol) TCP/IP (Transmission Control Protocol/Internet Protocol)
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The Web www anyone can put content on or retrieve information from it Google indexes more than 1 trillion Web pages There is no central control or administration of the Web W3C – World Wide Web Consortium Hosted by MIT (Cambridge, Mass) & INRIA (France) Supported by industry Develops & maintains Web-related standards, protocols, & services NOT LAWS!!! Neither criminal nor copyright
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IP Addresses The Internet is a global network that connects IP networks Each network is identified using an IP address Like a phone number for computers on the internet Current format: X.X.X.X where X is a number from 0 – 255 For example, the CS Dept. server is 130.245.1.44 We are rapidly running out of IP addresses, so it will have to be expanded
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URLs Uniform Resource Locator Identifies a document on the web Includes protocol, host name, path name, & file name Default file name for a directory is index.html or index.htm http://www.cs.sunysb.edu/~cse102/schedule.html Protocol is http Host is cs.sunysb.edu Directory (path) is ~cse102 Document is schedule.html
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The Browser What browsers are out there? IE, Netscape, Opera, Mozilla, etc … What does a browser do? Takes care of all the complicated network issues to retrieve documents from Web servers Interprets these documents and displays them accordingly Browsers can handle HTML & images Typically need plug-in programs to support other formats Users provide browsers URLs
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Content Types The Web supports all sorts of standard content types Common types: Content Type File Suffix text/html txt, html, htm image/jpeg jpeg, jpg, gif audio/basic au, snd audio/x-realaudio ra video/mpeg mpeg
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