域名 》防火墙 》防护墙规则 》 创建防火墙规则，如图：
表达式：
(cf.threat_score ge 5 and not cf.client.bot) or (not http.request.version in {"HTTP/1.2" "HTTP/2" "HTTP/3" "SPDY/3.1"}) or (not http.user_agent contains "Mozilla/")
上面的意思是威胁分数大于或等于5，且不是已知的合法爬虫，会质询； HTTP版本不是 “HTTP/1.2” “HTTP/2” “HTTP/3” “SPDY/3.1” 会质询； 请求头不带 Mozilla/ 会质询； 上面可能会误伤爬虫，那么再创建一个合法爬虫规则 表达式：
(cf.client.bot) or (http.user_agent contains "duckduckgo") or (http.user_agent contains "FBexternalhit") or (http.user_agent contains "Feedfetcher-Google") or (http.user_agent contains "LinkedInBot") or (http.user_agent contains "Mediapartners-Google") or (http.user_agent contains "msnbot") or (http.user_agent contains "Slackbot") or (http.user_agent contains "推特Bot") or (http.user_agent contains "ia_archive") or (http.user_agent contains "yahoo")
上面的合法爬虫允许访问。
实测，这两条规则能挡住95%以上的CC攻击，然后防火墙设置，安全级别建议设置为低，否则影响浏览体验。
还是那句话，任何攻击都有特征的，分析日志，然后对应屏蔽才是最好的办法。
(cf.client.bot) or (http.user_agent contains "duckduckgo") or (http.user_agent contains "FBexternalhit") or (http.user_agent contains "Feedfetcher-Google") or (http.user_agent contains "LinkedInBot") or (http.user_agent contains "Mediapartners-Google") or (http.user_agent contains "msnbot") or (http.user_agent contains "Slackbot") or (http.user_agent contains "推特Bot") or (http.user_agent contains "ia_archive") or (http.user_agent contains "yahoo")
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