Use "cache-control" configuration parameter.

The value of this parameter must contain colon-separated pairs "MediaType:cache-control value"

For example, if you need to cache all text/xml and text/plain files for 5 minutes (300 sec.) and other text/\* files for 10 minutes (600 sec.), use the next configuration:

<component>

   <type>org.exoplatform.services.jcr.webdav.WebDavServiceImpl</type>

   <init-params>

      <value-param>

         <name>cache-control</name>

         <value>text/xml,text/plain:max-age=300;text/*:max-age=600;</value>

      </value-param>

   <init-params>

<component>