# File lib_doc/rucy/erb.rb, line 42
    def filter_head(context, script_name, request, response, logger)
      if (response.status == 200) then
        context[:erb_enabled] = true
        context[:erb_src] = ''
      else
        context[:erb_enabled] = false
        context[:erb_src] = nil
        response.start_body
      end
      nil
    end