What?
Well I should be sleeping. But was testing some 1+ Gigabytes WAV in Safari and they did not play. But they Play on Chrome and Mozilla. Why? Bc Safari request them via a Range Request from 0 bytes to Filesize -1 ... (basically the whole thing) and PHP/Symfony/Drupal, under that condition assumes, well... you are asking for the whole file! No range for you, here is a 200 RESPONSE with no range ... (bc that is kinda obvious?) instead of a 206 with range the same as the requested ...
In this case I will give it to Symfony. The response is correct, but Safari is used in a LOT of places... so I will have to code my way around