1 files changed, 7 insertions, 23 deletions
diff --git a/actionpack/lib/action_controller/rewindable_input.rb b/actionpack/lib/action_controller/rewindable_input.rb
index 058453ea68..36f655c51e 100644
--- a/actionpack/lib/action_controller/rewindable_input.rb
+++ b/actionpack/lib/action_controller/rewindable_input.rb
@@ -3,33 +3,17 @@ module ActionController
     class RewindableIO < ActiveSupport::BasicObject
       def initialize(io)
         @io = io
-      end
-
-      def read(*args)
-        read_original_io
-        @io.read(*args)
-      end
-
-      def rewind
-        read_original_io
-        @io.rewind
-      end
-
-      def string
-        @string
+        @rewindable = io.is_a?(StringIO)
       end
 
       def method_missing(method, *args, &block)
-        @io.send(method, *args, &block)
-      end
-
-      private
-        def read_original_io
-          unless @string
-            @string = @io.read
-            @io = StringIO.new(@string)
-          end
+        unless @rewindable
+          @io = StringIO.new(@io.read)
+          @rewindable = true
         end
+
+        @io.__send__(method, *args, &block)
+      end
     end
 
     def initialize(app)