2 files changed, 2 insertions, 2 deletions
diff --git a/actionpack/lib/action_dispatch/http/mime_type.rb b/actionpack/lib/action_dispatch/http/mime_type.rb
index dfcf3a558f..25156a4c75 100644
--- a/actionpack/lib/action_dispatch/http/mime_type.rb
+++ b/actionpack/lib/action_dispatch/http/mime_type.rb
@@ -3,7 +3,7 @@ require 'active_support/core_ext/class/attribute_accessors'
 
 module Mime
   SET              = []
-  EXTENSION_LOOKUP = Hash.new { |h, k| h[k] = Type.new(k) unless k.blank? }
+  EXTENSION_LOOKUP = {}
   LOOKUP           = Hash.new { |h, k| h[k] = Type.new(k) unless k.blank? }
 
   def self.[](type)
diff --git a/actionpack/lib/action_dispatch/http/request.rb b/actionpack/lib/action_dispatch/http/request.rb
index 13ff049a97..4831b89bde 100755
--- a/actionpack/lib/action_dispatch/http/request.rb
+++ b/actionpack/lib/action_dispatch/http/request.rb
@@ -175,7 +175,7 @@ module ActionDispatch
       if ActionController::Base.use_accept_header
         Array(Mime[parameters[:format]] || accepts)
       else
-        [format]
+        [format, Mime[:all]]
       end
     end