title: Detecting URL called from android app
body: <p>I have developped an app (ios and android) that does a php request to a server. For security reasons I need to make sure that a user cant type in the same URL in a browser. Only the app should be allowed to do this request. I have been thinking at doing javascript browser detection and I get a good result for ios where it answers "Unknown" when called from the app. But for android, it always answers "Android", be it within the browser or when called by the app.
  Anyone out there having an idea on how to detect this on the server side?</p>