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记录一些常见的爬虫 UA，方便在爬虫访问是进行统计
| 主体 | user-agent | 用途 |
|---|---|---|
| googlebot | 搜索引擎 | |
| google-structured-data-testing-tool | 测试工具 | |
| Mediapartners-Google | Adsense广告网页被访问后，爬虫就来访 | |
| Microsoft | bingbot | 搜索引擎 |
| Linked | linkedinbot | 应用内搜索 |
| 百度 | baiduspider | 搜索引擎 |
| 奇虎 360 | 360Spider | 搜索引擎 |
| 搜狗 | Sogou Spider | 搜索引擎 |
| Yahoo | Yahoo! Slurp China | 搜索引擎 |
| Yahoo | Yahoo! Slurp | 搜索引擎 |
| 头条 | Bytespider | 搜索引擎 |
| twitterbot | 应用内搜索 | |
| facebookexternalhit | 应用内搜索 | |
| - | rogerbot | - |
| - | embedly | - |
| Quora | quora link preview | - |
| - | showyoubot | - |
| - | outbrain | - |
| - | - | |
| - | slackbot | - |
| - | vkShare | - |
| - | W3C_Validator | - |
nginx 判断：
if ($http_user_agent ~* "googlebot|bingbot|yandex|baiduspider|360Spider|Sogou Spider|Bytespider|twitterbot|facebookexternalhit|rogerbot|linkedinbot|embedly|quora link preview|showyoubot|outbrain|pinterest\/0\.|pinterestbot|slackbot|vkShare|W3C_Validator|whatsapp") {
## do something
}
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