ngx_http_write_filter  491 http/ngx_http_core_module.h ngx_int_t ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *chain);
ngx_http_write_filter  616 http/ngx_http_header_filter_module.c     return ngx_http_write_filter(r, &out);
ngx_http_write_filter  307 http/ngx_http_write_filter_module.c     ngx_http_top_body_filter = ngx_http_write_filter;