最近在做爬虫相关的项目，对UA有一定的要求，所以到网上找了几篇描述UA较详细的文章分享给大家。 1. [认识User-Agent - CSDN博客](http://blog.csdn.net/rj042/article/details/6991441 "认识User-Agent - CSDN博客") 2. [User agent - Wikipedia](https://en.wikipedia.org/wiki/User_agent "User agent - Wikipedia") 3. [History of the user-agent string - NCZOnline](https://www.nczonline.net/blog/2010/01/12/history-of-the-user-agent-string/ "History of the user-agent string - NCZOnline")
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