Can you redirect https//domain.com to https://www.domain.com

Try this:

when HTTP_REQUEST {
    if { [string tolower [HTTP::host]] equals "domain.com" } {
        HTTP::redirect "https://www.domain.com"
    }
}

If you need to also preserve the URI in the request, use this instead:

HTTP::redirect "https://www.domain.com[HTTP::uri]"