extra_tags_for_form

# File actionview/lib/action_view/helpers/form_tag_helper.rb, line 836
        def extra_tags_for_form(html_options)
          authenticity_token = html_options.delete("authenticity_token")
          method = html_options.delete("method").to_s

          method_tag = case method
            when /^get$/ # must be case-insensitive, but can't use downcase as might be nil
              html_options["method"] = "get"
              ''
            when /^post$/, "", nil
              html_options["method"] = "post"
              token_tag(authenticity_token)
            else
              html_options["method"] = "post"
              method_tag(method) + token_tag(authenticity_token)
          end

          if html_options.delete("enforce_utf8") { true }
            utf8_enforcer_tag + method_tag
          else
            method_tag
          end
        end