limit_conn_zone '$host' zone=conn_remote_addr_16:20m;
limit_conn conn_remote_addr_16 30;
limit_conn_status 429;

limit_req_zone '$remote_addr_16/$host' zone=req_remote_addr_16:20m rate=30r/m;
limit_req zone=req_remote_addr_16 burst=600 delay=596;
limit_req_status 429;

limit_rate 256k;