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From Epithemeus <epithemeus.afterthou...@googlemail.com>
Subject Re: Any way to make tomcat send the "disable caching" headers on all responses?
Date Tue, 18 Aug 2009 09:02:20 GMT

Thanks, Ognjen. It works like a charm now!

As you said, with the new parameter (current time, in the case that I used)
it forces the client to reload the xml file. And this updates the graph as
well. 

Regards,
Epithemeus



Ognjen Blagojevic-3 wrote:
> 
> Epithemeus wrote:
>> What is happening in practice is that: the xml file is indeed updated but
>> the graph being displayed is an older version (corresponding to the older
>> .xml file which has now been over-written). I gather that this means
>> tomcat
>> is caching the xml files.
>> 
>> I have tried including "cachingAllowed" to false in context.xml. I have
>> also
>> deleted the application_folder under
>> $TOMCAT_HOME\work\Catalina\localhost\.
>> Neither of these options has helped in disabling caching.
>> 
>> I would really appreciate any help on how I could get around this!
> 
> You could add parameter to the URL of the XML file, that changes every 
> time the file is modified. Something like
> 
>     src="data.xml?lastModificationTime=20090818000000"
> 
> or
> 
>     src="data.xml?hash=SOMEHASH(data.xml)"
> 
> or simply to read file every time, not only when it is changed:
> 
>     src="data.xml?currentSystemTime=20090818100601"
> 
> The change in parameter will force the client to reload the file.
> 
> The same thing is possible for CSS, images and other resources.
> 
> Regards,
> Ognjen
> 
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