http rewrite and pool selection based on method

thanks for the response, but still getting compile errors:

01070151:3: Rule [/Common/meh] error: /Common/meh:9: error: [undefined procedure:

Here is what I'm using:

first uri check to determine if it matches
method can be get or put, rewrite URI and route to appropriate pool
when HTTP_REQUEST {
  if {( [string tolower [HTTP::uri]] eq "/IMSWeb/IMSServlet" ) } {
        HTTP::uri "/ReservationService/IMSServlet"
      pool pool1.tcp.8780
     }
   check to determine appropriate method, perform switch statement
    if { [string tolower [HTTP::method]] eq "get" } {
       method is get, need to rewrite URI and route to appropriate pool
       switch -glob [string tolower [HTTP::uri] ] {
            "/IMSWeb/rest/services/inventory" {
         HTTP::uri "/ReservationService/IMSServlet"
          pool pool1.tcp.8780
         }
           "/IMSWeb/Lookup" {
          HTTP::uri "/ReservationService/UI/invLookUp"
            pool pool1.tcp.8780
         }
       }
   }
   else { [string tolower [HTTP::method]] eq "put" } {
     method is put, need to rewrite host & URI and route to appropriate pool
        switch -glob [string tolower [HTTP::uri] ] {
            "/IMSWeb/rest/services/item" {
          HTTP::host "foo.com"
          HTTP::uri "/iasserver/rest/services/item"
           pool pool2.tcp.80
           }
           "/IMSWeb/rest/services/inventory" {
         HTTP::host "foo.com"
          HTTP::uri "/iasserver/rest/services/inventory"
          pool pool2.tcp.80
           }       
        }
   }
}