gif url without extension & call without format will not fallback to noop

[forresto]

The only popular image host I've seen this with is GH: https://camo.githubusercontent.com/d9965ffe91e21a3794cca29d039559e9e10a670b/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f3339353330372f313736313534312f66666366303132612d363664322d313165332d383432332d6562323062383566616561612e676966

[forresto]

Actually that's an old url... new one has ext 👍 : https://cloud.githubusercontent.com/assets/395307/19598839/f777566e-976a-11e6-93c3-d4d09bc22705.gif

Still could be an issue, but probably not in wild very much.