Redirection not working

Hi Friends,

I was configuring redirect with three conditions and seems it is not working properly. Can anyone suggest if any changes on this code below?

when HTTP_REQUEST {
    set referrer_host [URI::host [HTTP::header value Referer]]
    if { ([string tolower [HTTP::host]] equals "yyy.com") and (([HTTP::uri] equals "/") and ( $referrer_host eq "www.abc.com") ) } {
        HTTP::respond 301 "Location" "https://xxx.com/login"
        return
    }
    if { ([string tolower [HTTP::host]] equals "yyy.com") and (([HTTP::uri] equals "/") and ( $referrer_host ne "www.xxx.com") ) } {
        HTTP::respond 301 "Location" "https://xxx.com/login"
        return
    }   
}

Is there any way we can use switch statements here?