QUESTION: How to use *only* cookies for session tracking?

[Gregory Gerard]

http://tomcat.apache.org/tomcat-5.5-doc/config/context.html
I can turn cookies on or off but I don't see a similar setting for  
URL rewriting.

I've already made my peace with requiring cookies for other reasons.

Possible? Downsides?

I'm seeing a lot of double fetching of content (JavaScript files and  
images) (once for when there's ;jsessionid= as part of the URL and  
again once the client's accepted the cookie and the URL is changed).

thanks,
greg