X-Sendfile header field is not set if rack 2.1.0 is installed (#32785).

git-svn-id: http://svn.redmine.org/redmine/trunk@19416 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/application.rb

@@ -60,7 +60,7 @@ module RedmineApp
     config.active_record.sqlite3.represent_boolean_as_integer = true
 
     # Sets the Content-Length header on responses with fixed-length bodies
-    config.middleware.insert_after Rack::Sendfile, Rack::ContentLength
+    config.middleware.insert_before Rack::Sendfile, Rack::ContentLength
 
     # Verify validity of user sessions
     config.redmine_verify_sessions = true