NGX_HTTP_IMAGE_BUFFERED  473 http/modules/ngx_http_image_filter_module.c     r->connection->buffered |= NGX_HTTP_IMAGE_BUFFERED;
NGX_HTTP_IMAGE_BUFFERED  486 http/modules/ngx_http_image_filter_module.c     r->connection->buffered &= ~NGX_HTTP_IMAGE_BUFFERED;