irule to replace Realm value for http response header WWW-Authenticate: Basic realm="IP address"

To mitigate against internal IP address disclosure in Basic Authentication Header, i'd like to change the IP address to some other value.

I tried changing "Basic Auth Realm" in http profile but it only works for some testing tools like wfetch but not for curl.

I also tried the following irule but it also works sometimes:

when HTTP_RESPONSE {

if { [HTTP::header "WWW-Authenticate"] starts_with "Basic" }{
HTTP::header replace WWW-Authenticate "Basic realm='mydomain.com'"
}
}