ngx_http_upstream_wr_check_broken_connection   24 http/ngx_http_upstream.c static void ngx_http_upstream_wr_check_broken_connection(ngx_http_request_t *r);
ngx_http_upstream_wr_check_broken_connection  481 http/ngx_http_upstream.c         r->write_event_handler = ngx_http_upstream_wr_check_broken_connection;