Works on 3.0.4

Gemfile

@@ -2,7 +2,7 @@ source "http://rubygems.org"
 
 gemspec
 
-gem "rails", "~> 3.0.0"
+gem "rails", "~> 3.0.4"
 
 group :test do
   gem "webrat", "0.7.2", :require => false

Gemfile.lock

@@ -1,53 +1,53 @@
 PATH
   remote: .
   specs:
-    devise (1.1.4)
+    devise (1.1.5)
       bcrypt-ruby (~> 2.1.2)
       warden (~> 1.0.2)
 
 GEM
   remote: http://rubygems.org/
   specs:
     abstract (1.0.0)
-    actionmailer (3.0.3)
-      actionpack (= 3.0.3)
-      mail (~> 2.2.9)
-    actionpack (3.0.3)
-      activemodel (= 3.0.3)
-      activesupport (= 3.0.3)
+    actionmailer (3.0.4)
+      actionpack (= 3.0.4)
+      mail (~> 2.2.15)
+    actionpack (3.0.4)
+      activemodel (= 3.0.4)
+      activesupport (= 3.0.4)
       builder (~> 2.1.2)
       erubis (~> 2.6.6)
       i18n (~> 0.4)
       rack (~> 1.2.1)
       rack-mount (~> 0.6.13)
-      rack-test (~> 0.5.6)
+      rack-test (~> 0.5.7)
       tzinfo (~> 0.3.23)
-    activemodel (3.0.3)
-      activesupport (= 3.0.3)
+    activemodel (3.0.4)
+      activesupport (= 3.0.4)
       builder (~> 2.1.2)
       i18n (~> 0.4)
-    activerecord (3.0.3)
-      activemodel (= 3.0.3)
-      activesupport (= 3.0.3)
+    activerecord (3.0.4)
+      activemodel (= 3.0.4)
+      activesupport (= 3.0.4)
       arel (~> 2.0.2)
       tzinfo (~> 0.3.23)
-    activeresource (3.0.3)
-      activemodel (= 3.0.3)
-      activesupport (= 3.0.3)
-    activesupport (3.0.3)
-    arel (2.0.4)
+    activeresource (3.0.4)
+      activemodel (= 3.0.4)
+      activesupport (= 3.0.4)
+    activesupport (3.0.4)
+    arel (2.0.8)
     bcrypt-ruby (2.1.2)
     bson (1.1.2)
     bson_ext (1.1.2)
     builder (2.1.2)
     columnize (0.3.2)
     erubis (2.6.6)
       abstract (>= 1.0.0)
-    i18n (0.4.2)
+    i18n (0.5.0)
     linecache (0.43)
-    mail (2.2.10)
+    mail (2.2.15)
       activesupport (>= 2.3.6)
-      i18n (~> 0.4.1)
+      i18n (>= 0.4.0)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.16)
@@ -65,19 +65,19 @@ GEM
     rack (1.2.1)
     rack-mount (0.6.13)
       rack (>= 1.0.0)
-    rack-test (0.5.6)
+    rack-test (0.5.7)
       rack (>= 1.0)
-    rails (3.0.3)
-      actionmailer (= 3.0.3)
-      actionpack (= 3.0.3)
-      activerecord (= 3.0.3)
-      activeresource (= 3.0.3)
-      activesupport (= 3.0.3)
+    rails (3.0.4)
+      actionmailer (= 3.0.4)
+      actionpack (= 3.0.4)
+      activerecord (= 3.0.4)
+      activeresource (= 3.0.4)
+      activesupport (= 3.0.4)
       bundler (~> 1.0)
-      railties (= 3.0.3)
-    railties (3.0.3)
-      actionpack (= 3.0.3)
-      activesupport (= 3.0.3)
+      railties (= 3.0.4)
+    railties (3.0.4)
+      actionpack (= 3.0.4)
+      activesupport (= 3.0.4)
       rake (>= 0.8.7)
       thor (~> 0.14.4)
     rake (0.8.7)
@@ -90,7 +90,7 @@ GEM
     thor (0.14.6)
     treetop (1.4.9)
       polyglot (>= 0.3.1)
-    tzinfo (0.3.23)
+    tzinfo (0.3.24)
     warden (1.0.2)
       rack (>= 1.0.0)
     webrat (0.7.2)
@@ -110,7 +110,7 @@ DEPENDENCIES
   mocha
   mongo (= 1.1.2)
   mongoid (= 2.0.0.beta.20)
-  rails (~> 3.0.0)
+  rails (~> 3.0.4)
   ruby-debug (>= 0.10.3)
   sqlite3-ruby
   warden (~> 1.0.2)

lib/devise/failure_app.rb

@@ -68,11 +68,11 @@ def redirect_url
     end
 
     def http_auth?
-      !Devise.navigational_formats.include?(request.format.to_sym) || (request.xhr? && Devise.http_authenticatable_on_xhr)
+      !Devise.navigational_formats.include?(request_format) || (request.xhr? && Devise.http_authenticatable_on_xhr)
     end
 
     def http_auth_body
-      method = :"to_#{request.format.to_sym}"
+      method = :"to_#{request_format}"
       {}.respond_to?(method) ? { :error => i18n_message }.send(method) : i18n_message
     end
 
@@ -103,5 +103,9 @@ def attempted_path
     def store_location!
       session[:"#{scope}_return_to"] = attempted_path if request.get? && !http_auth?
     end
+
+    def request_format
+      @request_format ||= request.format.respond_to?(:ref) ? request.format.ref : request.format
+    end
   end
 end

test/failure_app_test.rb

@@ -13,7 +13,7 @@ def call_failure(env_params={})
       'REQUEST_METHOD' => 'GET',
       'warden.options' => { :scope => :user },
       'rack.session' => {},
-      'action_dispatch.request.formats' => Array(env_params.delete('formats') || :html),
+      'action_dispatch.request.formats' => Array(env_params.delete('formats') || Mime::HTML),
       'rack.input' => "",
       'warden' => OpenStruct.new(:message => nil)
     }.merge!(env_params)