https://www.baidu.com/robots.txt
https://www.v2ex.com/robots.txt
http://www.taobao.com/robots.txt
"User-agent: Baiduspider
Disallow: /
User-agent: baiduspider
Disallow: /"是指不让百度给爬吗?
这样子指定 User-agent ,这么多爬虫?
User-agent: Baiduspider-image
User-agent: Googlebot
User-agent: YoudaoBot
User-agent: Sogou web spider
User-agent: Sogou inst spider
User-agent: Sogou spider2
User-agent: ChinasoSpider
update
补上相关链接 从robots.txt能看出什么?
v2 的没列~~