Cookies replacement

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# Rename a cookie by inserting a new cookie name with the same value as the original.  Then remove the old cookie.
when HTTP_REQUEST {
 # Check if old cookie exists in request
 if { [HTTP::cookie exists "old-cookie-name"] } {
   # Insert a new cookie with the new name and old cookie's value
   HTTP::cookie insert name "new-cookie-name" value [HTTP::cookie value "old-cookie-name"]
   # Remove the old cookie
   HTTP::cookie remove "old-cookie-name" 
  }
}