nginx/limit/limit.md

nginx.conf

    limit_req_zone $binary_remote_addr zone=req_limit_zone:10m rate=10r/s;
    limit_conn_zone $binary_remote_addr zone=conn_limit_zone:10m;
    limit_req_status 429;
    limit_conn_status 429;

limit.conf

    limit_req zone=req_limit_zone burst=100 nodelay;

    location = /robots.txt {
            default_type text/plain;
            return 200 "User-agent: *\nDisallow:\n";
    }

server.conf

server {
    ...
     include limit.conf;
    ...

}