Getting cookie value and using switch

It looks like after some testing, simply insert/replace the cookie gets the desired result. Here is the finished rule that demonstrates it operates, and that the switches are working properly.

when HTTP_REQUEST {
if {not [HTTP::cookie exists Data_Locale]}
    {set need_cookie 1}
set cookie_local [HTTP::cookie value Data_Locale]
switch $cookie_local
{
    www1
    {
    set need_cookie 0
    }
    www2
    {
    set need_cookie 3
    }
    www3
    {
    set need_cookie 1
    }
}
}

when HTTP_RESPONSE {
switch $need_cookie
{
    0
    {
    HTTP::cookie insert name Data_Locale value www2
    HTTP::cookie expires Data_Locale 1200 relative
    }
    1
    {
    HTTP::cookie insert name Data_Locale value www1
    HTTP::cookie expires Data_Locale 1200 relative
    }
    3
    {
    HTTP::cookie insert name Data_Locale value www3
    HTTP::cookie expires Data_Locale 1200 relative
    }
}
}