nginx 请求追加参数

location ^~ /znkf/ {
  proxy_pass http://192.168.1.99/;
  proxy_redirect off;
  proxy_set_header Host $http_host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-Fpr $proxy_add_x_forwarded_for;
  set $delimeter "";
  if ($is_args) {
    set $delimeter "&";
  }
  set $args "$args${delimeter}a=1&b=2";
}