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URL ReWriting

Venkat Perumalla

Joined: Sep 19, 2006
Posts: 20

Can anyone make me clear on URLRewriting concept and why can they be used for static pages

Thanks in Advance !!!

Venkata Gawtham Perumalla<br />"Wise People Learn from their Mistakes Wiser People Learn from Others Mistakes"
Dirk Lombard

Joined: Jul 27, 2005
Posts: 18
You use URL rewriting when the client has disabled cookies on the browser. URL rewriting takes the session ID that is in the cookie and stick it right onto the end of every URL that comes in to the application. The Container will strip of this extra part of the request URL and use it to find the matching session when a user request something from a link. All of this is necessary because HTTP is stateless so you cannot keep track of a users session unless you use cookies or URL rewriting.

Why it cannot be used in static pages (html) is for the same reason you can not use scripting and EL in static pages. HTML is not turned into some sort of JAVA class that will be executed. With a JSP the scripting or EL code is turned into JAVA code when the JSP is transformed into a servlet class that will be executed and the response send to the browser. You need a response.endcodeURL or <c:URL> to encode the URL for you and it will only work in a dynamic page.

SCJP 1.4<br />SCWCD 1.4
Venkat Perumalla

Joined: Sep 19, 2006
Posts: 20
Thanks Dirk
It is sorta covered in the JavaRanch Style Guide.
subject: URL ReWriting
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