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simple elegant way to get user agent in iOS swift 3 using a webview and a tiny bit of javascript

Here's a simple and elegant way to add a user-agent header to your headers dictionary in whatever networking framework you're using, if it doesn't provide the user-agent header out-of-the-box:

"User-Agent" : UIWebView().stringByEvaluatingJavaScript(from: "navigator.userAgent")!

we just init a webview, run a javascript that returns the user-agent from within the webview as a string, and use the value wherever you want (in the headers, eg)

have fun getting device user agent in swift!