Wrap everything in class << self.

actionpack/lib/action_dispatch/http/url.rb

@@ -4,27 +4,23 @@ module URL
       mattr_accessor :tld_length
       self.tld_length = 1
 
-      def self.extract_domain(host, tld_length = @@tld_length)
+      class << self
+        def extract_domain(host, tld_length = @@tld_length)
           return nil unless named_host?(host)
-
           host.split('.').last(1 + tld_length).join('.')
         end
 
-      def self.extract_subdomains(host, tld_length = @@tld_length)
+        def extract_subdomains(host, tld_length = @@tld_length)
           return [] unless named_host?(host)
           parts = host.split('.')
           parts[0..-(tld_length+2)]
         end
 
-      def self.extract_subdomain(host, tld_length = @@tld_length)
+        def extract_subdomain(host, tld_length = @@tld_length)
           extract_subdomains(host, tld_length).join('.')
         end
 
-      def self.named_host?(host)
-        !(host.nil? || /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.match(host))
-      end
-
-      def self.url_for(options = {})
+        def url_for(options = {})
           unless options[:host].present? || options[:only_path].present?
             raise ArgumentError, 'Missing host to link to! Please provide the :host parameter, set default_url_options[:host], or set :only_path to true'
           end
@@ -50,9 +46,12 @@ def self.url_for(options = {})
           rewritten_url
         end
 
-      class << self
         private
 
+        def named_host?(host)
+          !(host.nil? || /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.match(host))
+        end
+
         def rewrite_authentication(options)
           if options[:user] && options[:password]
             "#{Rack::Utils.escape(options[:user])}:#{Rack::Utils.escape(options[:password])}@"
@@ -72,11 +71,8 @@ def host_or_subdomain_and_domain(options)
           host << (options[:domain]    || extract_domain(options[:host], tld_length))
           host
         end
-
       end
 
-
-
       # Returns the complete URL used for this request.
       def url
         protocol + host_with_port + fullpath
@@ -168,7 +164,6 @@ def subdomains(tld_length = @@tld_length)
       def subdomain(tld_length = @@tld_length)
         subdomains(tld_length)
       end
-
     end
   end
 end