What did i do wrong with this irule for redirection based on url

when HTTP_REQUEST {

    Check if the request is for the root document
   if {[HTTP::path] eq "/" }{

       Check the Host header
      switch [string tolower [HTTP::host]] {
         "oem1.website.com" {
            HTTP::uri "/oem1/vin.aspx"
         }
         "oem2.website.com" {
            HTTP::uri "/oem2/vin.aspx"
         }
      }
   }
}