Manipulating Cache Properties 
Manipulating Cache Properties
Use
The
Internet Communication Framework is used to set the "cachability", the validity period, and the
ETag of an existing object when the HTTP response is being created.
Procedure
Use the following methods of the class
IF_HTTP_RESPONSE to set the cache properties for an object.
SERVER_CACHE_EXPIRE_ABS
You use this method to set the expiration period for the ICM Server Cache. An absolute date and time are given. The page contained in the cache is invalid after this date and time. The input parameters for this method are an absolute date, time, and the ETag of the object in question (optional).
SERVER_CACHE_EXPIRE_REL
Sets a relative expiration period (in seconds) for the ICM server cache The input parameters are the seconds (from the current time) and the ETag (optional).
SERVER_CACHE_EXPIRE_DEFAULT
Activates the ICM server cache and sets the default expiry period.