diff --git a/oa-core/lib/omniauth/core.rb b/oa-core/lib/omniauth/core.rb
index 4dacde6..5f2f71e 100644
--- a/oa-core/lib/omniauth/core.rb
+++ b/oa-core/lib/omniauth/core.rb
@@ -3,35 +3,35 @@ require 'singleton'
 require 'omniauth/form'
 
 module OmniAuth
-  
+
   autoload :Builder,  'omniauth/builder'
   autoload :Strategy, 'omniauth/strategy'
   autoload :Test,     'omniauth/test'
-  
+
   module Strategies
     autoload :Password, 'omniauth/strategies/password'
   end
-  
+
   class Configuration
     include Singleton
-    
+
     @@defaults = {
       :path_prefix => '/auth',
       :on_failure => Proc.new do |env, message_key|
         new_path = "#{OmniAuth.config.path_prefix}/failure?message=#{message_key}"
-        [302, {'Location' => "#{new_path}"}, []]
+        [302, {'Location' => "#{new_path}", 'Content-Type'=> 'text/html'}, []]
       end,
       :form_css => Form::DEFAULT_CSS
     }
-    
+
     def self.defaults
       @@defaults
     end
-    
+
     def initialize
       @@defaults.each_pair{|k,v| self.send("#{k}=",v)}
     end
-    
+
     def on_failure(&block)
       if block_given?
         @on_failure = block
@@ -39,19 +39,19 @@ module OmniAuth
         @on_failure
       end
     end
-    
+
     attr_writer :on_failure
     attr_accessor :path_prefix, :form_css
   end
-  
+
   def self.config
     Configuration.instance
   end
-  
+
   def self.configure
     yield config
   end
-  
+
   module Utils
     CAMELIZE_SPECIAL = {
       'oauth' => 'OAuth',
@@ -60,31 +60,31 @@ module OmniAuth
       'open_id' => 'OpenID',
       'github' => 'GitHub'
     }
-    
+
     module_function
-    
+
     def form_css
       "<style type='text/css'>#{OmniAuth.config.form_css}</style>"
     end
-    
+
     def deep_merge(hash, other_hash)
       target = hash.dup
-    
+
       other_hash.keys.each do |key|
         if other_hash[key].is_a? ::Hash and hash[key].is_a? ::Hash
           target[key] = deep_merge(target[key],other_hash[key])
           next
         end
-      
+
         target[key] = other_hash[key]
       end
-    
+
       target
     end
-    
+
     def camelize(word, first_letter_in_uppercase = true)
       return CAMELIZE_SPECIAL[word.to_s] if CAMELIZE_SPECIAL[word.to_s]
-      
+
       if first_letter_in_uppercase
         word.to_s.gsub(/\/(.?)/) { "::" + $1.upcase }.gsub(/(^|_)(.)/) { $2.upcase }
       else