Nginx实现404页面的三种方法

https://cloud.tencent.com/developer/article/1444870

 server {
     listen      80;
     server_name  www.test.com;
         root   /var/www/test;
         index  index.html index.htm;
     location / {
     }
     # 定义错误页面码，如果出现相应的错误页面码，转发到那里。
     error_page  404 403 500 502 503 504  /404.html;
     # 承接上面的location。
     location = /404.html {
     # 放错误页面的目录路径。
         root   /usr/share/nginx/html;
     }
 }

 if ($http_user_agent ~ "YunSecurityBot|BBScan|360Spider|YisouSpider|AhrefsBot|qihoobot|Yahoo! Slurp|Yahoo! Slurp China|YoudaoBot|Sosospider|Sogou spider|Sogou web spider|MSNBot|ia_archiver|Tomato Bot|CometHTTP|MJ12bot|Feedly|YandexBot|HttpClient|omgili|Python-urllib|python-requests") {
              return 416;
    }