- fix HTTP_STATE_RELAY == SOCKS_STATE_CONNECTING enum collision (relay data dropped) - fix wrong waiter cancel (etcp_router_waiter_cancel -> etcp_router_cancel_send_ready) - add backpressure retry timer, restore lost queue_resume_callback, defer FIN on pending tx_buf - async_dns: /etc/hosts fast-path + hosts loading (avoid 4s DNS timeout for localhost)