*Redirect http to https & add www to URL if none present*

Try this:

when HTTP_REQUEST {
    if { not ( [string tolower [HTTP::host]] starts_with "www." ) } {
        HTTP::redirect "https://www.[HTTP::host][HTTP::uri]"
    } else {
        HTTP::redirect "https://[HTTP::host][HTTP::uri]"
    }
}

This works. Thank you.