1 files changed, 0 insertions, 12 deletions
diff --git a/actionpack/lib/action_dispatch/middleware/session/abstract_store.rb b/actionpack/lib/action_dispatch/middleware/session/abstract_store.rb
index b03244d025..3e8d64b0c6 100644
--- a/actionpack/lib/action_dispatch/middleware/session/abstract_store.rb
+++ b/actionpack/lib/action_dispatch/middleware/session/abstract_store.rb
@@ -93,13 +93,6 @@ module ActionDispatch
         :cookie_only =>   true
       }
 
-      # This regular expression is used to split the levels of a domain:
-      # So www.example.co.uk gives:
-      # $1 => www.
-      # $2 => example
-      # $3 => co.uk
-      DOMAIN_REGEXP = /^(.*\.)*(.*)\.(...|...\...|....|..\...|..)$/
-
       def initialize(app, options = {})
         @app = app
         @default_options = DEFAULT_OPTIONS.merge(options)
@@ -129,11 +122,6 @@ module ActionDispatch
             cookie[:expires] = Time.now + options.delete(:expire_after)
           end
 
-          if options[:domain] == :all
-            env["HTTP_HOST"] =~ DOMAIN_REGEXP
-            options[:domain] = ".#{$2}.#{$3}"
-          end
-
           request = ActionDispatch::Request.new(env)
           set_cookie(request, cookie.merge!(options))
         end