How to configure Nginx rush purchase current limit

The code is as follows:

limit_req_zone $server_name zone=sname:10m rate=1r/s;        #限制服务器每秒只能有一次访问成功
  #limit_req_zone $binary_remote_addr zone=one:3m rate=1r/s;    #限制ip，每秒只能访问一次
  #limit_req_zone $binary_remote_addr $uri zone=two:3m rate=1r/s;  #限制ip和路径不带参数，
  #limit_req_zone $binary_remote_addr $request_uri zone=thre:3m rate=1r/s;  #限制ip和带参数的路径

server {
  listen    80;
  server_name www.abc.com;
  location / {
      include host/proxy.cnf;
      proxy_pass http://backend;
  }
  location /api/createorder {
      limit_req zone=sname;  #不带突发，只能有一次正常请求
      limit_req_status 503;    #设置返回的状态码是503
      #limit_req zone=sname burst=5 nodelay;  #最大并发是5，并且实时处理
      include host/proxy.cnf;
      proxy_pass http://backend;
      error_page 503 =200 /50x.html;   #这里很重要，可以将错误的状态码503，返回结果的时候是200
  }
  location = /50x.html {
      if ($http_user_agent ~* "mobile|android|iphone|iphone|ios|ios"){
          #default_type application/json;
          return 200 '{"msg": "活动过于火爆，请稍后重试!","data": {},"code": -1}';  #设置移动端返回错误的信息显示
      }
      root  html;   #如果是pc端返回一个html页面
  }
  }

Key point: Under normal circumstances, if the current limit is set, the return status code is 503. For the mobile terminal, even if you return json data, the client At this time, I cleverly set the status code to 200 through error_page 403 =200 /50x.html;

The above only uses ngx_limit_req_module, and the ngx_limit_conn_module module can also be used.

Especially if some consulting websites are targeted by crawlers, the server may be killed by the crawlers (this is the case for small websites)
So what should we do? We can use variables to do it

#全局配置
limit_req_zone $spider zone=spider:60m rate=200r/m;  #限制爬虫每分钟只能跑200次
#某个server中
limit_req zone=spider burst=5 nodelay;
if ($http_user_agent ~* “spider|bot”) {
  set $spider $http_user_agent;   #设置变量，进入这里的就进行限速
}

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