ua-parser-js
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Handle Email Proxies
Gmail and Yahoo proxy images and use a special User-Agent String. This library is unable to parse them properly. There might be other email proxies.
Gmail: Mozilla/5.0 (Windows NT 5.1; rv:11.0) Gecko Firefox/11.0 (via ggpht.com GoogleImageProxy)
Yahoo Mail: YahooMailProxy;%20https://help.yahoo.com/kb/yahoo-mail-proxy-SLN28749.html