Hi Anurag I have had the exact same problem and posted in http://www.gossamer-threads.com/lists/apache/users/382031?page=last You can use ExpiresDefault/ExpiresByType (this adds both an Expires and Cache-Control: max-age header to simultaneously support HTTP 1.0 and HTTP 1.1) or use LocationMatch. For example, I could distinguish between static content requests (requests to *.gif) vs dynamic content requests (requests to *.jsp or *.do for a Struts application) using the LocationMatch. I couldn't find a way of using LocationMatch to work with the content-type of the response, which was what I needed for file download requests. Nor could I find a way of checking whether the header was set, before setting it. (I'm still asking the question). In the end, I have set the values using e.g. servlet filters in my application code. thanks, Balj.
On Mon, Mar 15, 2010 at 12:50 PM, Anurag Kapur <anuragka...@gmail.com>wrote: > Hello, > > I am looking for some help to set HTTP response headers conditionally. I > have a setup where HTTPD sits in front of Tomcat and proxies requests to it. > > *Problem Statement* > Set a Cache-Control max-age directive in the HTTP response header through > HTTPD if it doesn't already exist. In addition if HTTPD after detecting that > the directive is not already set in the response header, it should set one > depending on the response mime-type. > > Example: > HTTPD proxies a request to tomcat -> Tomcat processes the request and send > back the response to HTTPD -> HTTPD checks if Cache-Control max-age > directive is set in the response header. If present it does no changes to > the response header and simply forwards the response back to the user. > However, if the Cache-Control max-age directive is not present it sets one > depending on the response mime type (say max-age=900 for text/html and > max-age=1800 for image/gif) > * > * > *System Info* > $ apachectl -version > Server version: Apache/2.2.9 (Unix) > Server built: Sep 12 2008 16:23:39 > > $ uname -a > SunOS vm-sol10-45 5.10 Generic_127128-11 i86pc i386 i86p > > *What I Have Tried* > I have been trying to work with mod_setenvif module to start but have not > made any progress and thus seeking your help. > > Any inputs would be highly appreciated. > > Regards > Anurag > * > *------------------------------------------------------------------ > Anurag Kapur > Associate - Technology, > Sapient Corporation. > > http://www.linkedin.com/in/anuragkapur > > http://www.google.com/profiles/anuragkapur > ------------------------------------------------------------------ >
