Why override `User-Agent` with `X-UCBrowser-UA`?

[jiabinf]

X-UCBrowser-UA header is a pretty much proprietary format:

• Android:

  dv(MI NOTE LTE);pr(UCBrowser/11.2.5.884);ov(Android 6.0.1);ss(392*698);pi(1080*1920);bt(UC);pm(1);bv(1);nm(0);im(0);sr(0);nt(2);
  

• iPhone:

  dv(iPh9,1);pr(UCBrowser/11.3.0.895);ov(10_2);ss(375x667);bt(UC);pm(0);bv(0);nm(0);im(0);nt(2);
  

In this case, express-useragent detects this Android phone as Android tablet device. This issue possibly happens on other Android devices which UC browser is running on.

[mohdarifa]

For Android Mobile - UC browser "isTable" true