Unfortunately this isn't a configurable option yet within ASM but it is a feature that has been requested.
You would have to modify the cookie via iRule to get the result you want.
== Sample iRule ==
when RULE_INIT {
# Cookie name prefix
set static::ck_pattern "TS*"
# Log debug to /var/log/ltm? 1=yes, 0=no
set static::ck_debug 1
}
when HTTP_REQUEST {
set incoming_domain [HTTP::host]
if {$static::ck_debug}{log local0. "incoming domain name: [HTTP::host]"}
}
when HTTP_RESPONSE_RELEASE {
if {$static::ck_debug}{log local0. "Cookie names: [HTTP::cookie names]"}
# Check if the cookie names in the response match our string glob pattern
if {[set cookie_names [lsearch -all -inline [HTTP::cookie names] $static::ck_pattern]] ne ""}{
# We have at least one match so loop through the cookie(s) by name
if {$static::ck_debug}{log local0. "Matching cookie names: [HTTP::cookie names]"}
foreach cookie_name $cookie_names {
HTTP::cookie attribute $cookie_name remove domain
HTTP::cookie attribute $cookie_name insert " Domain" ".$incoming_domain"
}
}
if {$static::ck_debug}{log local0. "Cookie header(s): [HTTP::header values Set-Cookie]"}
}