{%macro add_http_feature_flags()%}
{%for flag in http_feature_flags():%}
{%if (request.args.get(flag) or request.form.get(flag) or ""):%}
<input type="hidden"
       name="{{flag}}"
       value="{{(request.args.get(flag) or request.form.get(flag))}}" />
{%endif%}
{%endfor%}
{%endmacro%}