How to modify nginx configuration to limit the frequency of malicious crawlers

The code is as follows:

#全局配置

limit_req_zone $anti_spider zone=anti_spider:10m rate=15r/m;

#某个server中

limit_req zone=anti_spider burst=30 nodelay;

if ($http_user_agent ~* “xxspider|xxbot”) {

set $anti_spider $http_user_agent;

}

If the set limit frequency is exceeded, a 503 will be given to the spider.

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