User Agent

Mozilla/5.0 (Linux; U; Android 8.1.0; zh-cn; MI 8 Build/OPM1.171019.011) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.108 Mobile Safari/537.36

This user agent belongs to Android WebView. Google Inc developed this Browser. This Browser run on Android and it renders web contents with Blink on general Mobile Phone.

Browser - Android WebView

Android WebView

Version57.0 @ 32 bit
DeveloperGoogle Inc
ParentAndroid WebView 57.0
Device TypeMobile Phone

Act as 

Crawler No
Fake No
Anonymized No

Device - XiaoMi

BrandXiaoMi
ModelMI 8
Platform android 8.1 (32 bit) by Google Inc
Mobile Yes
Tablet No

Capabilities

Rendering EngineBlink by Google Inc (a WebKit Fork by Google)
Pointingtouchscreen
Javascript Yes
CSS Yes Version: 3
Cookies Yes
Tables Yes
Frames Yes
IFrames Yes
Background Sounds No
Java Applets No
VB Script No
Activex No