What is User-Agent

• User Agent is a part of the HTTP protocol and a component of the header field. User Agent is also referred to as UA. It is a special string header that provides information to the visited website about the type and version of the browser you are using, the operating system and version, the browser kernel, etc. Through this identifier, the website visited by the user can display different layouts to provide a better experience for the user or to perform information statistics; for example, accessing Google with a mobile phone is different from accessing it with a computer. These are determined by Google based on the visitor's UA. UA can be disguised.
• The standard format of the browser's UA string is: browser identifier (operating system identifier; encryption level identifier; browser language) rendering engine identifier version information. However, each browser is different.
• To put it simply, the back-end recognizes the computer, mobile phone, WeChat, etc.

Common User-Agent

Common User-Agents for Windows/Android/iOS

Computer UA

Computer Chrome

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Computer WeChat

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36 NetType/WIFI MicroMessenger/7.0.20.1781(0x6700143B) WindowsWechat(0x6307062c)

Baidu Spider

Mozilla/5.0 (compatible; Baiduspider/2.0; +http://www.baidu.com/search/spider.html)

Computer Google Spider

Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)

Mobile UA

Mobile Android

Mozilla/5.0 (Linux; Android 10; SM-G981B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.162 Mobile Safari/537.36

Apple mobile phone

Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1

Apple WeChat

Mozilla/5.0 (iPhone; CPU iPhone OS 14_2_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 MicroMessenger/7.0.18(0x17001231) NetType/2G Language/zh_CN

WeChat on Android phone

Mozilla/5.0 (Linux; Android 9; HMA-AL00 Build/HUAWEIHMA-AL00; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/77.0.3865.120 MQQBrowser/6.2 TBS/045434 Mobile Safari/537.36 MMWEBID/6874 MicroMessenger/7.0.10.1580(0x27000AFE) Process/tools NetType/4G Language/zh_CN ABI/arm64

Baidu Spider Mobile

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)

Related references

• More UA:http://www.fynas.com/ua
• JS judgment code:https://gist.github.com/zhanghqgit/315fed5452d9994b84a3096df7ca302c