What is User-Agent?

• User Agent, or UA, is a part of the HTTP protocol, specifically a header field. It's a special string header that identifies the user's browser type and version, operating system and version, browser engine, and other information. This identifier allows websites to display different layouts to provide a better user experience or to collect statistics; for example, accessing Google on a mobile phone differs from accessing it on a computer, as Google uses the user's UA to determine this. UA can be spoofed.
• The standard format of a browser's User Agent (UA) string includes: browser identifier (operating system identifier; encryption level identifier; browser language) and rendering engine version information. However, this varies from browser to browser.
• Simply put, it means the backend can recognize desktop, mobile, WeChat, and other devices.

Common User-Agent

A comprehensive list of common User-Agents for Windows, Android, and iOS.

PC User Agent

Chrome on PC

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

WeChat on PC

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 on PC

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

Google Spider on PC

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

Mobile User Agent

Android phones

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

iPhone

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

Android WeChat

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 on 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 UAs:http://www.fynas.com/ua
• JavaScript conditional code:https://gist.github.com/zhanghqgit/315fed5452d9994b84a3096df7ca302c