NGINX allow/block location by request method and IP

allow_clients.conf

geo $allow_client {
  default no;
  10.0.1.183 yes;
}

server.conf

include /etc/nginx/conf.d/allow_clients.conf;

server {
  location /x {
    set $postall "";
    if ($request_method = POST) {
      set $postallow "post${allow_client};
    }
    if ($postallow = postno) {
      return 403;
    }
  }

}