Subrequest in range-filter

Server NGINX
1

hi,

I want to write a filter, which may create some subrequests.
And all of these subrequests need be supported by range-filter
(src/http/modules/ngx_http_range_filter_module.c).
But there is a check in range-header-filter, something like this:
if(r!=r->main) return ngx_http_next_header_filter®;
It seem that the range-filter does not support the subrequest.
So I get 2 questions.

  1. why dose the range-filter not support the subrequest?
  2. If I want to write a filter which create subrequests that need range
    support, how?

Thanks,
Wu