Whitelist request throttling in Nginx?

gistfile1.txt

http {
    map $whitelist $limit {
      default $binary_remote_addr;
      1 "";
    }

    limit_conn_zone $limit zone=conn_limit_per_ip:10m;
    limit_req_zone $limit zone=req_limit_per_ip:10m rate=5r/s;
    
    server {
      set $whitelist "";
      if ( $hostname = some_url.com ) {
        set $whitelist 1;
      }

      limit_conn conn_limit_per_ip 10;
      limit_req zone=req_limit_per_ip burst=30 nodelay;
    }
  }