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URI handlers
- 1. URI HANDLERS 1 - SERVER-SIDE TECHNOLOGIES By : Sayalee Pote
- 2. What is a URI? 2 U - Uniform R - Resource I - Identifier “A URI is a string of characters used to identify a name of a web resource.” Example: http://en.wikipedia.org/wiki/Web_engineering
- 3. Relationship between URI, URL and URN. Uniform Resource Name (URN) Uniform Resource Locator (URL) URL: file:///home/username/books/RomeoAndJuliet.pdf URN:isbn:0-486-27557-4 3
- 4. URI Handlers 4 ACCEPT REQUEST EXECUTION RETURN RESULT
- 5. Various URI handlers: Server-Side Includes (SSI) CGI/FastCGI Server-side Scripting Servlets Java Server Pages (JSP) ASP.NET 5
- 6. Server-Side Includes (SSI) Directives that are placed in HTML pages. Evaluated on the server while the pages are being served. They let you add dynamically generated content to an existing HTML page. Special file extension : shtml Syntax: <!--#element attribute=value attribute=value ... --> Example: <!--#echo var="DATE_LOCAL" --> 6
- 7. SSI supports the following commands: include <!--#include virtual="/cgi-bin/counter.pl" --> //outputs the results of a CGI program exec <!--#exec cmd="dir" --> //gives you a directory listing 7
- 8. CGI/FastCGI 8 CGI stands for Common Gateway Interface. Standardized interface between Web servers and application programs. Use of Form tags of HTML. READ PARAMETERS PROCESS THEM CREATE AN OUTPUT AS HTML DOCUMENT
- 9. Server-side scripting Introduces Active Server Pages (ASP) All URI handlers mentioned here define a script language. Executed by a script interpreter. HTML files saved with an extension .asp Not limited to one single scripting language. 9
- 10. Servlets Enhancement of CGI technology in Java Invoked by special URLs to process incoming requests. Multi-Threading capabilities. Offer session tracking. 10
- 11. JSP Dynamically generated web pages Released by Sun microsystems Similar to PHP Deployment of JSP 11
- 12. WHY USE JSP?? vs ASP vs Pure Servlets vs JavaScript vs Static HTML 12
- 13. JSP MODEL 13
- 14. SAMPLE CODE <!DOCTYPE html> <html> <body> <p>Click the button to get a time-based greeting.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() {var x=""; var time=new Date().getHours(); if (time<20) {x="Good day"; } else {x="Good evening"; } document.getElementById("demo").innerHTML=x; } </script> </body> </html> 14
- 15. OUTPUT 15
- 16. ASP.NET Static web pages Next generation of ASPs. ASP.NET is a valuable tool for programmers Use of .NET languages is allowed besides script languages Visual Studio Server side Eg: Amazon.com,eBay.com 16
- 17. OVERVIEW Object Oriented Programming Page gets compiled into an intermediate language Intermediate code is converted to machine code Machine code is eventually run on the processor 17
- 18. 18 THANK YOU!