Solution : https://service.sap.com/sap/support/notes/901250 (SAP Service marketplace login required)
Key words : 
kernel parameter itsp/cachecontrol/maxage, basis support package 10 solution implement, basis support package 19 andwebas 700, path /sap/public/bc/, patches/support packages, cache expiration time, http server cache, terms max-age, max-age=43200, kernel patch 149
Related Notes : 
       
| 885580 | Integrated ITS: Configuration Parameters |