HTTP Compression & Caching

Hi,

How to apply HTTP compression & caching under below irule. For eg: if requirement is to apply http compression only for "green.lab.ae"

iRule:

when HTTP_REQUEST {
switch [string tolower [HTTP::host]] {
red.lab.ae {
pool Red_Pool1 }

green.lab.ae {
pool Green_Pool1 }

}
}