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Welcome to CSC667/867. Internet Application Design and Development Dr. Ilmi Yoon. NOTE: Course note courtesy to Ellis Horowits (USC CS571) and PrenticeHall (Deitel & Associates). The materials are modified to fit to CSc667/867 with permissions from authors. . Topics – what you will learn.

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Welcome to csc667 867 l.jpg

Welcome to CSC667/867

Internet Application Design and Development

Dr. Ilmi Yoon

NOTE: Course note courtesy to Ellis Horowits (USC CS571) and PrenticeHall (Deitel & Associates). The materials are modified to fit to CSc667/867 with permissions from authors.


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Topics – what you will learn

  • Web Application Architecture

    • Principles, Protocols and Practices

  • Understanding of core technology, not platform specific knowledge

  • Pre-WWW, Internet, TCP/IP

  • Web Server, Browser, HTTP

  • Client side technologies

  • Server side technologies

  • E-commerce system & DB connections

  • Web application development & Deployment

  • XML and its applications

  • Emerging technologies

    • Web services, Semantic Web, Data exploration, 3Ds on the WWW, Security and more…


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Course Overview

  • Mechanism and various technologies of Internet applications through projects

    • Develop your own web server (using JAVA)

      • 2 people team project

    • Experiment JavaScript/Python CGI project

      • Individual project

    • Develop and Deploy an Internet application

      • 4 people team project

  • Advanced Issues

  • Most of all, not only knowledge, you will learn the experience of building large application, team work, searching for necessary information from given large resources and build confidence in yourself!


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Course Overview

  • Going through course overview using printed syllabus

    • exams, grading policy, late penalty

  • Survey


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Announcements

  • TA – Berdnt Jung (Thu 2:00 ~ 3:00)

  • Participating in Annotizer project using course web site

  • Start to think of term project as early as possible!!!

    • IOC Project (presentation by Gauri)

    • Art work on view (www.artworkonview.org )

    • SFSU CS Alumni site

    • WICE (Web-based Interactive Computing Environment)

  • HTML 1 & 2 for self study

  • Assignment 1 is now available on the course web site


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Defining the World Wide Web

  • A wide-area hypertext, multimedia information retrieval system that provides access to a large universe of documents

  • A uniform way of accessing and viewing some information on the Internet

  • The WWW

    • creates a world in which information has a reference by which it can be accessed

    • subsumes the capabilities of ftp, gopher, wais and news


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History of the World Wide Web

  • WWW

    • Allows computer users to locate and view multimedia-based documents

    • Introduced in 1990 by Tim Berners-Lee for astrophysicist to share documents

  • Internet today

    • Mixes computing and communications technologies

    • Makes information constantly and instantly available to anyone with a connection


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The Internet and the WWW are Different

  • The Internet is a global digital infrastructure that connects millions of computers and tens of millions of people

  • The World Wide Web is a mechanism that unifies the retrieval and display of a subset of data on the Internet

  • An intranet is a local/global information structure that connects an organization internally


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Major Technology Components

  • Client/server architecture

    • where client programs interact with web servers

  • Network protocol

    • HTTP, Hypertext Transfer Protocol, is the language understood by browsers and web servers

    • designed to move quickly from document to document

  • Addressing system (Uniform Resource Locators)

    • http://domain/directory/file.html

  • Markup Language

    • every web server understands and every browser displays

    • includes support for Hypertext and multimedia


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Basic Internet Definitions

  • http://www.pierobon.org/iis/ by Pierobon

  • Simple definitions for LAN, WAN, Internet, WWW, Hypertext, Intranet, Extranet, Protocol, TCP/IP, UDP, Address, Domain, Domain Name, Plug-in, URL, URI, socket and a short quiz!



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The WWW Server

  • Web browsers and Web servers communicate according to a protocol known as HTTP (HyperText Transfer Protocol)

    • The current HTTP protocol is version 1.1

  • The Web server is a software system running on a machine often called the Web server, don’t confuse them

  • A web server can

    • receive and reply to HTTP requests

    • retrieve documents from specified directories

    • run programs in specified directories

    • handle limited forms of security

  • A web server does not

    • know about the contents of a document, links in a document, images in a document or whether a particular file, e.g. a *.gif file, is in the correct format


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Uniform Resource Locator

A mechanism whereby an Internet resource can be specified in a single line of ASCII text

1. Scheme followed by a colon http:,ftp:,gopher:,news:,mailto:,wais:,telnet:

file://pub/xt.ps (aPostScript file in directory pub on your local machine) ftp://cs.sfsu.edu/docs/sweng.txt (a file sweng.txt in directory docs on cs.sfsu.edu, an anonymous ftp) http://nunki.usc.edu/mydocs/book.doc (a file in directory mydocs on machine nunki.usc.edu)

2. Double slash (only for http, ftp, gopher, wais) //

3. Internet domain name e.g., cs.sfsu.edu

4. Port number (this field is optional; e.g., pollux.usc.edu:8081)

-- Standard or default port numbers:

--- ftp is 21 gopher is 70

--- telnet is 23 http is 80

--- smtp is 25 nntp is 119

5. Path e.g., /pub/docs


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Markup Languages

  • HTML - hypertext markup language, specifies document layout and the specification of hypertext links to text, graphics and other types of objects

  • browsers display text and graphics using the markup as guidance

  • However, HTML is not like a word processing program, e.g. Microsoft Word or WordPerfect, and not like a page description languages, e.g. postscript

    • as a result, translation into HTML can produce a result that does not look exactly like the original

  • XML (extensible markup language)


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History of the Internet

  • ARPAnet

    • Implemented in late 1960’s by ARPA (Advanced Research Projects Agency of DOD)

    • Networked computer systems of a dozen universities and institutions with 56KB communications lines

    • Grandparent of today’s Internet

    • Intended to allow computers to be shared

    • Became clear that key benefit was allowing fast communication between researchers – electronic-mail (email)


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History of the Internet (II)

  • ARPA’s goals

    • Allow multiple users to send and receive info at same time

    • Network operated packet switching technique

      • Digital data sent in small packages called packets

      • Packets contained data, address info, error-control info and sequencing info

      • Greatly reduced transmission costs of dedicated communications lines

    • Network designed to be operated without centralized control

      • If portion of network fails, remaining portions still able to route packets


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History of the Internet (III)

  • Transmission Control Protocol (TCP)

    • Name of protocols for communicating over ARPAnet

    • Ensured that messages were properly routed and that they arrived intact

  • Organizations implemented own networks

    • Used both for intra-organization and communication

  • Huge variety of networking hardware and software appeared

    • ARPA achieved inter-communication between all platforms with development of the IP

      • Internetworking Protocol

      • Current architecture of Internet

    • Combined set of protocols called TCP/IP


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History of the Internet (IV)

  • The Early Internet

    • Limited to universities and research institutions

    • Military became big user

    • Next, government decided to release Internet for commercial purposes

  • Internet traffic grew

    • Businesses spent heavily to improve Internet

      • Better service for their clients

    • Fierce competition among communications carriers and hardware and software suppliers

    • Result

      • Bandwidth (info carrying capacity) of Internet increased tremendously



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Network Basics

  • A host is a computer that is enabled to function on a network

  • any set of hosts connected in such a way that any two hosts can send and receive messages is called a network

    • a protocol is the method by which two computers agree to communicate

    • an address space is the set of names of computers that can be referenced


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LAN + Internet Access

  • Speak TCP/IP and add a Domain Name Server

  • A router may be located either at your site

  • or at your ISP


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IP and TCP/IP

  • To be a host on the Internet your computer must:

    • have a host/domain name, e.g. tlaloc.sfsu.edu

    • be assigned a unique IP address, e.g. 128.125.2.1 (static or dynamic IP)

    • use the Internet protocol

    • have a network connection that provides a route to the Internet


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IP Addresses

  • An IP address is a 32-bit number, from 0 to about 4.3billion

  • These numbers are written as four sets of eight bits each, network.subnetwork.subnetwork.computer

  • The next generation of IP is IPv6

    • it uses a 128 bit address space


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Internet Domain Names

  • A domain name has the following form:

    • [subdomain].[subdomain].[…].domain

    • E.g. my email address includes my name, host and domain name, [email protected]

  • U.S. domains are divided into the following logical categories

    • com commercial and industrial organizations

    • edu educational institutions

    • gov non-military, government affiliated organizations

    • mil military organizations

    • net network operations

    • org other organizations and user groups


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Reading Assignment

  • Read Chapter 1 & 2 from Web Application Architecture

    • Definitions of web page, web site, web application

    • TCP/IP,Telnet, SMTP (Simple Mail Transfer Protocol), POP (Post Office Protocol), IMAP (Internet Message Access Protocol)

  • Extra credit for those who read these chapters and write a short summary report and post its url at course web site using Annotizer

  • Read “Basic Internet Definitions” and take the quiz, print out and bring it back to classroom


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