Disable dispatcher caching for specific requests
I have created a filter for asset requests to DAM. For certain assets, I want to completely disable caching in the dispatcher and AEMaaCS CDN.
Is it enough to simply set the headers from Java, or do I need to also apply some logic in the dispatcher?
For instance, I am doing something like this:
public static void removeResponseCaching(SlingHttpServletResponse response) {
response.setHeader("Surrogate-Control", "no-store");
response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate, max-age=0");
response.setHeader("Dispatcher", "no-cache");
response.setHeader("Pragma", "no-cache");
response.setHeader("Expires", "0");
}
However, I am noticing that cache control headers are still coming back for certain requests even though this code is being executed.
I am trying something like this in my vhost:
<LocationMatch "^/content/.*\.coreimg.*\.(?i:jpe?g|png|gif|svg)$">
<If "%{HTTP:Cache-Control} in { 'no-cache' }">
Header unset Cache-Control
Header unset Expires
Header set Expires 0
Header set Age 0
Header set Cache-Control "no-cache"
Header set Surrogate-Control "private"
</If>
<Else>
Header set Cache-Control "max-age=2592000,stale-while-revalidate=43200,stale-if-error=43200,public,immutable" "expr=%{REQUEST_STATUS} < 400"
Header set Age 0
</Else>
</LocationMatch>
If I make a request to the file and supply Cache-Control: no-cache on the request, then the response contains the proper Cache-Control: no-cache header. However, if the request doesn't have the Cache-Control directive, it seems that the Cache-Control header is being set to
