to_a

# File actionpack/lib/action_dispatch/http/response.rb, line 140
    def to_a
      assign_default_content_type_and_charset!
      handle_conditional_get!
      self["Set-Cookie"] = self["Set-Cookie"].join("\n") if self["Set-Cookie"].respond_to?(:join)
      self["ETag"]       = @_etag if @_etag
      super
    end