Http header insert depending on host

guys to be more clear with the request.

I need to add below, depending on the host i get request from . I have to 2 host pointing to same VIP.

when HTTP_RESPONSE { HTTP::header insert Strict-Transport-Security "max-age=3600" }

You need to set a variable in HTTP_REQUEST to use in HTTP_RESPONSE;-

when HTTP_REQUEST {
    set fSTS 0
    if {[string tolower [HTTP::host]] eq "blah.com.au"} {
         Set flag for use in HTTP_RESPONSE
        set fSTS 1    
    }
}
when HTTP_RESPONSE {
    if {$fSTS} {
        HTTP::header insert Strict-Transport-Security "max-age=3600" 
    }
}