利用Nginx user_agent 屏蔽指定的爬虫怎么实现跳转,详细教程如下

#禁止Scrapy等爬虫工具的抓取
if ($http_user_agent ~* "Scrapy|Sogou web spider") {
  return 403;
}
#禁止指定UA及UA为空的访问
if ($http_user_agent ~ "FeedDemon|JikeSpider|Indy Library|Alexa Toolbar|AskTbFXTV|AhrefsBot|CrawlDaddy|CoolpadWebkit|Java|Feedly|UniversalFeedParser|ApacheBench|Microsoft URL Control|Swiftbot|ZmEu|oBot|jaunty|Python-urllib|lightDeckReports Bot|YYSpider|DigExt|YisouSpider|HttpClient|MJ12bot|heritrix|EasouSpider|LinkpadBot|Ezooms|^$" )
{
  return 403;
}
#禁止非GET|HEAD|POST方式的抓取
if ($request_method !~ ^(GET|HEAD|POST)$) {
  return 403;
}

if ($http_user_agent ~ "Mozilla/4.0\ \(compatible;\ MSIE\ 6.0;\ Windows\ NT\ 5.1;\ SV1;\ .NET\ CLR\ 1.1.4322;\ .NET\ CLR\ 2.0.50727\)") { 
   return 404;
}

if ( $http_user_agent ~* "(iPhone|iPad|iPod|iOS|Android|Mobile|nokia|samsung|htc|blackberry)") {
            set $client "1";
          }        
        if ($client = '1') {
              proxy_pass http://111.com;
              break;
        }
        if (!-f $request_filename) {
              proxy_pass http://222.com;
               break;
        }