HTTP/2 does not allows to write in folders in Drupal 7, how can I fix? I've recently changed from HTTP 1.1 to HTTP/2, as soon as i did it I was not able to create or edit files from backoffice (both image upload or css/js cache), but if I did it from FTP there is no problem

All the folders are 755 and all the files are 644 and I could not get other informations

Varnich cache is not installed on the server, what can cause the problem?
Solution found, just needed to install suPHP module and configure it so apache could execute php with owner permissions instead of default user