Deleting a specific profile's RAM cache via iControlREST

I'm attempting to use the iControl REST API to purge a specific profile's RAM cache. My understanding is that I should be able to send a DELETE request to the specific cache's URL (i.e. However, this doesn't seem to accomplish anything. Regardless of the URL I use, I get back an empty (content length = 0) response with code 200 (OK).

My main source of info is: https://devcentral.f5.com/questions/how-to-clear-cache-via-icontrolrest

Thanks.