gistfile1.rb

def call(source, request)
  if request.ssl?
    case
    when javascript_file?(source)
      ssl_asset_host(source)
    when safari?(request)
      asset_host(source)
    when firefox?(request) && image_file?(source)
      asset_host(source)
    else
      ssl_asset_host(source)
    end
  else
    asset_host(source)
  end
end

gistfile2.txt