# File lib_doc/rucy/erb.rb, line 33
    def filter_open(context, script_name, request, response, logger)
      request.delete_header('If-Match')
      request.delete_header('If-None-Match')
      request.delete_header('If-Modified-Since')
      request.delete_header('If-Unmodified-Since')
      request.delete_header('If-Range')
      nil
    end