1 files changed, 8 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/request.rb b/actionpack/lib/action_controller/request.rb
index 6e73a69ed7..032b19d6eb 100755
--- a/actionpack/lib/action_controller/request.rb
+++ b/actionpack/lib/action_controller/request.rb
@@ -122,6 +122,14 @@ module ActionController
       @path_parameters ||= {}
     end
     
+    # Returns true if the request's "X-Requested-With" header contains
+    # "XMLHttpRequest". (The Prototype Javascript library sends this header with
+    # every Ajax request.)
+    def xml_http_request?
+      env['HTTP_X_REQUESTED_WITH'] =~ /XMLHttpRequest/i
+    end
+    alias xhr? :xml_http_request?
+    
     #--
     # Must be implemented in the concrete request
     #++