3 files changed, 13 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index ae4470d033..0b7b09ee7a 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -180,6 +180,11 @@ module ActionDispatch
           @set.add_route(*mapping)
           self
         end
+
+        def default_url_options=(options)
+          @set.default_url_options = options
+        end
+        alias_method :default_url_options, :default_url_options=
       end
 
       module HttpHelpers
diff --git a/actionpack/lib/action_dispatch/routing/route_set.rb b/actionpack/lib/action_dispatch/routing/route_set.rb
index 2b9fc9e0de..26f37161a7 100644
--- a/actionpack/lib/action_dispatch/routing/route_set.rb
+++ b/actionpack/lib/action_dispatch/routing/route_set.rb
@@ -186,6 +186,7 @@ module ActionDispatch
 
       attr_accessor :routes, :named_routes
       attr_accessor :disable_clear_and_finalize, :resources_path_names
+      attr_accessor :default_url_options
 
       def self.default_resources_path_names
         { :new => 'new', :edit => 'edit' }
@@ -196,6 +197,7 @@ module ActionDispatch
         self.named_routes = NamedRouteCollection.new
         self.resources_path_names = self.class.default_resources_path_names.dup
         self.controller_namespaces = Set.new
+        self.default_url_options = {}
 
         @disable_clear_and_finalize = false
         clear!
@@ -404,6 +406,8 @@ module ActionDispatch
       RESERVED_OPTIONS = [:anchor, :params, :only_path, :host, :protocol, :port, :trailing_slash, :skip_relative_url_root]
 
       def url_for(options)
+        options = default_url_options.merge(options || {})
+
         handle_positional_args(options)
 
         rewritten_url = ""
diff --git a/actionpack/test/dispatch/routing_test.rb b/actionpack/test/dispatch/routing_test.rb
index b46276c453..f5fcf9b0df 100644
--- a/actionpack/test/dispatch/routing_test.rb
+++ b/actionpack/test/dispatch/routing_test.rb
@@ -15,6 +15,8 @@ class TestRoutingMapper < ActionDispatch::IntegrationTest
   stub_controllers do |routes|
     Routes = routes
     Routes.draw do
+      default_url_options :host => "rubyonrails.org"
+
       controller :sessions do
         get  'login' => :new, :as => :login
         post 'login' => :create
@@ -189,6 +191,8 @@ class TestRoutingMapper < ActionDispatch::IntegrationTest
 
       assert_equal '/login', url_for(:controller => 'sessions', :action => 'create', :only_path => true)
       assert_equal '/login', url_for(:controller => 'sessions', :action => 'new', :only_path => true)
+
+      assert_equal 'http://rubyonrails.org/login', Routes.url_for(:controller => 'sessions', :action => 'create')
     end
   end