[tonmoy]

This is the tester/hacker in me talking, but have you checked for cases where one can loop your own images hundreds of times? (e.g. https://i.scaley.io/jpg/i.scaley.io/png/i.imgur.com/DZjrx4E.... but more than 2 times)

A simple url DOS attack from my puny browser may cripple your entire server.