前面得添加User-Agent:
百度 PC UA
Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)
Mozilla/5.0 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
百度移动 UA
Mozilla/5.0 (Linux;u;Android 4.2.2;zh-cn;) AppleWebKit/534.46 (KHTML,like Gecko) Version/5.1 Mobile Safari/10600.6.3 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)
Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1 (compatible; Baiduspider-render/2.0; +http://www.baidu.com/search/spider.html)
百度图片UA
Baiduspider-image+(+http://www.baidu.com/search/spider.htm)
神马搜索User-Agent：
神马搜索 PC UA
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.81 YisouSpider/5.0 Safari/537.36
神马搜索移动 UA
Mozilla/5.0 (iPhone; CPU iPhone OS 10_3 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) CriOS/56.0.2924.75 Mobile/14E5239e YisouSpider/5.0 Safari/602.1
谷歌User-Agent：
谷歌 PC UA
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
谷歌移动UA
AdsBot-Google-Mobile (+http://www.google.com/mobile/adsbot.html) Mozilla (iPhone; U; CPU iPhone OS 3 0 like Mac OS X) AppleWebKit (KHTML, like Gecko) Mobile Safari
谷歌图片UA
Mozilla/5.0 (compatible; Googlebot-Image/1.0; +http://www.google.com/bot.html)
搜狗User-Agent：
搜索 PC UA
Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)
搜狗图片 UA
Sogou Pic Spider/3.0(+http://www.sogou.com/docs/help/webmasters.htm#07)
搜狗新闻UA
Sogou News Spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)
搜狗视频UA
Sogou Video Spider/3.0(+http://www.sogou.com/docs/help/webmasters.htm#07)
360搜索User-Agent：
360搜索UA
Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0);
360移动UA
Mozilla/5.0 (Linux; U; Android 4.0.2; en-us; Galaxy Nexus Build/ICL53F) AppleWebKit/534.30 (KHTML, like Gecko)Version/4.0 Mobile Safari/534.30; 360Spider
Mozilla/5.0 (Linux; U; Android 4.0.2; en-us; Galaxy Nexus Build/ICL53F) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30; HaosouSpider
360安全UA
360spider (http://webscan.360.cn)
必应User-Agent：
Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)
搜搜User-Agent：
搜搜UA：
Sosospider+(+http://help.soso.com/webspider.htm)
搜搜图片UA：
Sosoimagespider+(+http://help.soso.com/soso-image-spider.htm)
雅虎User-Agent：
雅虎中文UA：
Mozilla/5.0 (compatible; Yahoo! Slurp China; http://misc.yahoo.com.cn/help.html)
雅虎英文UA：
Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp)