PHP Input Stream Truncated at 8192 bytes

I'm working on a project on Symfony 3 as an API and Angular as a front (This is not relevant i think but hey).



When some datas are sent through a PUT request to the server, the data are truncated at 8192 bytes.



I checked for every file configurations (apache files, even cli file, .htacces file... but can't seem to find the issue.)



Weirdest thing, is the issue is on the dev server, the same request on the production server works (all the 18 000~ bytes are sent correctly), so i even tried to take the production server's php configuration file, but even that failed. Just to add on the information, the server runs on php 7.



I'm at a loss, what could i have missed ?



I'm pretty sure the issue comes from a configuration file, or a knowledge i'm missing. So help would be greatly appreciated.



Thanks.



Edit: After a bit of forcing... Here is a .tar.gz containing the files requested:




https://files.fm/u/ddghdx36