ngx_http_cleanup_pt  305 http/ngx_http_request.h typedef void (*ngx_http_cleanup_pt)(void *data);
ngx_http_cleanup_pt  310 http/ngx_http_request.h     ngx_http_cleanup_pt               handler;
ngx_http_cleanup_pt  299 http/ngx_http_upstream.h     ngx_http_cleanup_pt             *cleanup;