diff --git a/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/mongrel.rb b/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/mongrel.rb
index a0c890c..57efed3 100644
--- a/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/mongrel.rb
+++ b/actionpack-2.3.2/lib/action_controller/vendor/rack-1.0/rack/handler/mongrel.rb
@@ -63,9 +63,13 @@ module Rack
           response.status = status.to_i
           response.send_status(nil)
           headers.each { |k, vs|
-            vs.split("\n").each { |v|
-              response.header[k] = v
-            }
+            if vs.respond_to?(:split)
+              vs.split("\n").each { |v|
+                response.header[k] = v
+              }
+            else
+              response.header[k] = vs
+            end
           }
           response.send_header