Redirection to the same pool

when HTTP_REQUEST {

    Check the requested host header set to lower case with wildcard matching
   switch -glob [string tolower [HTTP::host]] {
      "a.example.com" {
          Redirect the client to a hardcoded URL with the first field of the requested host header
            appended to the URI
         HTTP::redirect "http://www.example.com/[getfield [HTTP::host] " " 1]"
      "b.example.com" {
         HTTP::redirect "http://www.example.com/[getfield [HTTP::host] " " 1]"
      "c.example.com" {
         HTTP::redirect "http://www.example.com/[getfield [HTTP::host] " " 1]"
      }
   }
}