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1 HTTP Web Web web Web Late 1980 s Concept of Engineering Workstation 1M workstation (1 MIPS, 1MB memory, 1M pixel display) UNIX system + Ethernet Research & Education environment Campus Network University s (undergraduate) students use campus network environment, but what can the university provide that system? Evolution of Information service Pilot services Gopher for directory services Client / server model Hierarchical menu navigation & multimedia (text & images) WAIS for digital library Client server Z39.50 protocol (ISO std.) for information retrieval

2 World Wide Web Late 1980 s, CERN Client / Server model Sharing research information over the Internet Technical / research articles shared over the internet Mechanism for annotation Text only system, but structured document hyper text Initial engine implemented in early 1990 s, Servers, clients by CERN and other groups University of Illinois's NCSA Mozaic Multimedia hypertext mid 1990 s: standardization process Around year 2K: industrialize much on many countries client Web browser GET uri Server response Mime document server Web server client server client server GET uri cgi-bin GET uri Server response Server response Web browser Web server Web browser Web server Mime document Mime document CGI (common gateway interface) MIME 3 7 Helper application MIME plug-in) 3 8 2

3 client Web browser POST data Server response server Web server Uniform Resource Identifier RFC 3986 Uniform Resource Identifier (URI): Generic Syntax Hyper Text Markup Language (HTML) RFC1866, HTML version 2.0 HTML 4.01 (W3C doc.) XHTML 1.1 (W3C doc.) HTML is a media type of MIME framework RFC2045, Multipurpose Internet Mail Extensions (MIME), Part One: Format of Internet Message Bodies Hyper Text Transfer Protocol (HTTP) RFC1945, HTTP v1 RFC2616, HTTP v URI scheme://authority/path?query#fragment scheme: authority: user@host:port path: ( query: fragment: MIME Unicode helper flash File uploader, blog, CGM, web2.0 Web server CGI-BIN

4 Web Web PC Web browser ATM Web I/FPC Windows Linux IP Web Backend system ( Web web http server on Vxworks, Linux, T-engine, etc. I/F web YouTube Cisco JuniperNetworks Web HDD

5 - Google maps IEEE Digital Library Web (convergence) Webware Cybozuweb etc. Web

6 Web CERN (1990) NCSAMosaic IETF & W3C 1990 Web Microsoft Internet Explorer, Netscape Navigator Adobe Transition Model of Socializing technology Transition Model of Socializing technology Standardization De Facto Regulations Marketing strategies CERN & NCSA Standardization De Facto IETF Regulations Marketing strategies Technology Development Engineering Deployment Technology Development Open Source Community Engineering Industries Deployment W3C No demarcation No demarcation

7 HTTP.. (1) HTTP = General Purpose Data Transmission Protocol ( Request / response MIME (helper) Web browser http server HTTP.(2) MIME MIME client HTTP server MIME HTTP File format MIME Helper read-only (read-only) Web 2.0 idempotent read-only contents supplier Contents uploader 3 27 Idempotent DB

8 HTTP https : SSL, TLS, etc. SSL/TLS SSL - 1 ID X SSL - 2 Simple is good enough HyperText HTML cgi-bin (input field)

9 server server client Server MIME HTTP Client HTML Style sheet XHTML Cgi-bin OSS Server client HTTP, MIMEIETF (Open Source Software) industry IETF, W3C ) Adobe, Microsoft Text information blog Flush 1990 Mozaic 1994 real networks 1996 What s s else? 1web PPT

10 CGM web? Customer Generated Media Web2.0 Web 2.0 Blog SNS (Social Network System) CGM Customer Generated Media Helper applications helper application Adobe flush Java script & program Helper application web browser Security is our first priority, but how? Scalability on server configuration Realtime applications can be supported by this web architecture? Web 2.0 movement Retro fit problem if we have an old application sever, say developed in year

11 web world web PPT1 Web Web web web Pros & Cons

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