http to https redirect working but want to add www.

Your irule does not include uppercase URLs:

the following irule will allow you to redirect needed hosts:

when HTTP_REQUEST {
    switch -glob [string tolower [HTTP::host]] {
        "abc.com" -
        "www.abc.com" -
        "*.abc.com" { HTTP::redirect https://www.abc.com[HTTP::uri] }
    }
}

I added www.abc.com and *.abc.com to show different ways with switch command.