Index: lib/mongrel/rails.rb
===================================================================
--- lib/mongrel/rails.rb        (revision 346)
+++ lib/mongrel/rails.rb        (working copy)
@@ -61,7 +61,7 @@
         end

         path_info = request.params[Mongrel::Const::PATH_INFO]
-        page_cached = path_info + ".html"
+        page_cached = path_info + ActionController::Base.page_cache_extension
         get_or_head = @@file_only_methods.include? request.params[Mongrel::Cons
t::REQUEST_METHOD]

         if get_or_head and @files.can_serve(path_info)