help with XML refresh and cache control

[Jim Owens <jowens@xxxxxxxx>]

I'm using Apache on an intranet to serve an XML database. Users can 
modify what they see by selecting radio buttons on an HTML form. The 
form sends off a CGI GET request with different parameters, based on the 
buttons selected -- for example, generic_xsl.rex?product=A&revision=B. 
The script generates a customized XSLT file called "specific.xsl" and 
then sends the XML file with an xsl:stylesheet header invoking specific.xsl.

On some browsers, successive different requests don't change the 
display. The user has to hit Refresh to see the updated XSLT output.

To solve this, I've added to the Apache configuration:

header Cache-Control no-cache

This works, but has side effects. Now when the user returns to the HTML 
form, the previously selected buttons are cleared.  Also, of course, 
caching is completely disabled, which doesn't seem like good practice.

Is there a way I can use no-cache selectively -- say, only when the 
script is invoked, or only when the referring page is the HTML form? 
I'mn aware that Header has an env= option, but I can't figure out how to 
use it here.

Alternatively, is there a better way to avoid the problem?










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