Web Applications

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Presentation Transcript

Web Application : 

Web Application Vishal Ghelani Nov 2008

Structure : 

Structure a web application is commonly structured as a three-tiered application Web Browsers (Presentation) Engine using some dynamic Web content technology (Application Logic) Database (Storage)

Client – Server Interaction : 

Client – Server Interaction Adv Server ISAM MySql

Request Header Example : 

Request Header Example GET / HTTP/1.1 Host: localhost:8181 Connection: keep-alive Referer: http://localhost/~ronyeh/ User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-us) AppleWebKit/124 (KHTML, like Gecko) Safari/125 Accept: */* Accept-Encoding: gzip, deflate;q=1.0, identity; q=0.5, *;q=0 Accept-Language: en-us, ja;q=0.62, de-de;q=0.93

HTTP Server Response Codes : 

HTTP Server Response Codes 200 OK 3XX -- Minor Client Error 301 -- File Moved Permanently 302 -- Moved Temporarily 304 -- Not Modified 4XX -- Major Client Error 400 -- Syntax Error 401 -- Unauthorized 403 -- Forbidden, Permission Denied 404 -- Not Found! 5XX -- Server Errors 500 -- Internal Server Error 503 -- Service Unavailable

HTML : 

HTML HyperText Markup Language

Document Structure : 

Document Structure <html> <head> <title>My First Web Page</title> </head> <body bgcolor="white"> <p>A Paragraph of Text.</p> </body> </html>

Nested Tags : 

Nested Tags Like a tree, each element is contained inside a parent element Each element may have any number of attributes <body>...</body> bgcolor="white"

HTML Common Tags : 

<!-- --> <head> <body> <title> <p> <div> <a> <table> <tr> <td> <th> <br> <h*> <li> <ol> <img> <form> <input> Text Radio Select Checkbox Button Hidden Textarea HTML Common Tags

Special characters : 

Special characters

Consideration to Quality? : 

Consideration to Quality? Lack of consideration to: Navigation Accessibility Scalability Reliability Maintainability Usability Compatibility and interoperability Security Readability