Secure cookie from a specified pool

Hello, Try changing the comparison operator (contains, ends_with), like this:

when HTTP_RESPONSE {
    if { [LB::server pool] ends_with "xyz_pool" } {
        HTTP::cookie secure "JSESSIONID" enable
    }
}

Or you can try like this:

when HTTP_RESPONSE {
    if { [LB::server pool] equals "/Commom/xyz_pool" } {
        HTTP::cookie secure "JSESSIONID" enable
    }
}

Because the statement "[LB::server pool]" aggregate partitions name in your result.