No headers filter for a subrequest

[Marat Dakota]

Hi,

I was digging the reason why add_header in nginx config doesn't work for a
subrequest and I've found this in ngx_http_headers_filter_module.c:

    if ((conf->expires == NGX_HTTP_EXPIRES_OFF && conf->headers == NULL)
        || r != r->main)
    {
        return ngx_http_next_header_filter(r);
    }

Is there a particular reason to skip the filter for everything that's not a
main request?

--
Marat
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