adding the Last-Modified response header to the version action

app/controllers/old_node_controller.rb

@@ -26,6 +26,8 @@ class OldNodeController < ApplicationController
   def version
     begin
       old_node = OldNode.find(:first, :conditions => {:id => params[:id], :version => params[:version]} )
+      
+      response.headers['Last-Modified'] = old_node.timestamp.rfc822
 
       doc = OSM::API.new.get_xml_doc
       doc.root << old_node.to_xml_node

app/controllers/old_relation_controller.rb

@@ -25,6 +25,8 @@ class OldRelationController < ApplicationController
   def version
     begin
       old_relation = OldRelation.find(:first, :conditions => {:id => params[:id], :version => params[:version]} )
+      
+      response.headers['Last-Modified'] = old_relation.timestamp.rfc822
 
       doc = OSM::API.new.get_xml_doc
       doc.root << old_relation.to_xml_node

app/controllers/old_way_controller.rb

@@ -13,7 +13,7 @@ class OldWayController < ApplicationController
 
       way.old_ways.each do |old_way|
         doc.root << old_way.to_xml_node
-     end
+      end
 
       render :text => doc.to_s, :content_type => "text/xml"
     rescue ActiveRecord::RecordNotFound
@@ -27,6 +27,8 @@ class OldWayController < ApplicationController
     begin
       old_way = OldWay.find(:first, :conditions => {:id => params[:id], :version => params[:version]} )
       
+      response.headers['Last-Modified'] = old_way.timestamp.rfc822
+      
       doc = OSM::API.new.get_xml_doc
       doc.root << old_way.to_xml_node