Web Fundamentals

Web Fundamentals 4 th September 2007 WWW, Internet, and other weird stuff

This is not a presentation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is Internet? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is (the) Web? ,[object Object],[object Object],[object Object],[object Object],[object Object]

HTTP? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DNS ,[object Object],[object Object],[object Object],[object Object]

Domain Name ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Port

A simple web request Browser Name Server Internet Web Server IIS, Apache, Lighttpd etc. BIND, PowerDNS, djbdns HTTP Response DNS Lookup http://bookmarks.rediff.com/recent/ bookmarks.rediff.com => 210.210.93.86

Cookies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How Cookies work? 2) Response from Web server 3) 2 nd request from browser 1) Request from Browser GET /index.html HTTP/1.1 Host: bookmarks.rediff.com HTTP/1.1 200 OK Content-type: text/html Set-Cookie: name=value; expires=date; path=/; domain=.rediff.com (content of page) GET /popular/ HTTP/1.1 Host: bookmarks.rediff.com Cookie: name=value Accept: */* expires=Fri, 31-Dec-2027 23:59:59

Session ,[object Object],[object Object],[object Object],[object Object],GET /popular/ HTTP/1.1 Host: bookmarks.rediff.com Cookie: PHPSESSID=4dy1q2e3d44c5dj343s3aq9

Moral of the story ,[object Object],[object Object],[object Object],[object Object]

Session Security ,[object Object],[object Object],[object Object],[object Object],[object Object],X sessionid CPU temperature Current date time Other junk stuff

Session Security ,[object Object],[object Object],[object Object],[object Object]

Forms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

HTTP Error codes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Multi Tier App Web Server Internet Web Server - Static File Serving - Caching - Proxying Database Server - Storage of Data - Retrieval - Some Biz logic Database Server Application Server App Server - Biz Logic - Processing - Modifying Data J2EE, ASP.NET, PHP, RoR, Python Apache/TomCat, IIS, lightTPD MS SQL, MySQL, Oracle

Simple Question ,[object Object],[object Object],[object Object],[object Object]

Believe me ,[object Object],[object Object],[object Object],[object Object]

MVC ,[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object]

Web Fundamentals

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Web Fundamentals