asset_host and ssl pages problem

I am configuring assets hosts for our site but am running into problems when navigating to an https page. Basically the server is trying to pull the assests out on https:// rather than http:/ but i do not have https configured on the assets server. I have dug around a bit and found this bit of code which should when a page is https:// serve the assests from the app server and when it is not https serve the assets from the assets server.

ActionController::Base.asset_host = { |source, request|   if request.ssl?     "#{request.protocol}#{request.host_with_port}" # Disable asset hosting.   else     "#{request.protocol}" # Use asset host.   end }

but i always get this error when navigating to any page

Showing layouts/admin.html.erb where line #8 raised: You have a nil object when you didn't expect it! The error occurred while evaluating nil.ssl?

Extracted source (around line #8): 5: <head> 6: <meta http-equiv="content-type" content="text/html;charset=UTF-8" /> 7: <title></title> 8: <%= stylesheet_link_tag 'shared', 'legacy_admin', 'admin', :media => "all" %> 9: <%= javascript_include_tag :defaults %> 10: <%= javascript_include_tag 'clocks.js' %> 11: </head>

i have also tried this config.action_controller.asset_host = do |source, request|    request.ssl? || source = /javascripts/ ? "#{request.protocol}#{request.host_with_port}" : "" end

but i get the same problem.

Any body else seen this problem? I am using rails 2.0.2 with mod_rails 1.0.5 and apache 2.2.6

turns out i needed rails 2.1.0 and actionpack 2.1.0 as there was a patch needed to asset_tag_helper.rb that i did not have.