Infogram: Is the 504 Gateway Time-out error ok?

Link: https://infogram.com/api/merge/auth/google/?redirectto=123&token=gulHMyL6-1H0Am4zXa4H7j0DWomPdnKPhZOk&redirectto=123 it gives 504 after a long time! Is it normal? It can be used for DOS! I use two redirectto= if I use just one redirectto= it gives the response fastly!...

Uber: Pixel flood attack in https://riders.uber.com/profile

Hi, It is the exact issue described here: https://hackerone.com/reports/390 Where uploading lottapixel.jpg it causes your service to time out HTTP/1.1 504 Gateway Time-out Server: nginx Date: Wed, 30 Mar 2016 02:29:22 GMT Content-Type: text/html; charset=utf-8 Content-Length: 13928 Connection:...