How can Google detect a request is from a WebView?

Question

Google announced that they \"will no longer allow OAuth requests to Google in embedded browsers known as \'web-views\'\".

In Android, requests from WebViews get

Answer 1

You can differentiate via the user agent string. See https://mobiforge.com/research-analysis/webviews-and-user-agent-strings

e.g. default chrome browser contains the following "(KHTML, like Gecko) Chrome/xx.xx..." but default webviews are of the following pattern "(KHTML, like Gecko) Version/4.0 Chrome/xx.xx.." It seems webview has an extra version string.