Prefer using prepend instead of alias_method_chain when it is defined

lib/turbolinks.rb

@@ -45,7 +45,11 @@ def call_with_turbolinks(env)
 
       ActiveSupport.on_load(:action_view) do
         (ActionView::RoutingUrlFor rescue ActionView::Helpers::UrlHelper).module_eval do
-          include XHRUrlFor
+          if defined?(prepend) && Rails.version >= '4'
+            prepend XHRUrlFor
+          else
+            include LegacyXHRUrlFor
+          end
         end
       end
     end

lib/turbolinks/xhr_url_for.rb

@@ -3,6 +3,14 @@ module Turbolinks
   # option by using the X-XHR-Referer request header instead of the standard Referer
   # request header.
   module XHRUrlFor
+    def url_for(options = {})
+      options = (controller.request.headers["X-XHR-Referer"] || options) if options == :back
+      super
+    end
+  end
+
+  # TODO: Remove me when support for Ruby < 2 && Rails < 4 is dropped
+  module LegacyXHRUrlFor
     def self.included(base)
       base.alias_method_chain :url_for, :xhr_referer
     end