subrequest in range-filter

[Wu Bingzheng]

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(r);
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
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