Hi All,
When cookies are disabled in the browser, a common way to enable session
tracking is by using URL rewriting. Tomcat (and Wicket) seem to do this
quite neatly. However, for static resources (such as images, stylesheets
and the like) hard coded in markup templates, the URL's are never
rewritten.
I hear you say, why would you want session tracking on static resources?
The answer is quite intricate. We use a loadbalancer that is JSESSIONID
aware (both in cookies and URL's) to also provide session affinity. To
gracefully update our websites (both code and static resources) we
inform the loadbalancer to stop sending new sessions to one or more of
the web servers. Once all current sessions have expired, the web servers
can be redeployed and the loadbalancer reconfigured to forward requests
to it again. This means that during the deployment of a new version of a
site, there are different versions of the site available to the clients
at the same time. If requests to the loadbalancer for static resources
don't contain session information, the loadbalancer might send the
request to the wrong server and retrieve for example the wrong version
of a style sheet or image.
The way it would be done in a JSP would be to have the developer
explicitly wrap each link in a JSP script (encodeURL or something). I
think you will agree that the JSP method is rough at best. However,
given that Wicket has to preprocess the markup templates, is the any
conceivable way to get it also re-write URL's if the browser doesn't
support cookies?
Kind regards,
/james
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James Carnegie
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Fax: (+44) (0) 1179081494
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