Problem solved !
For Nginx :
- Delete
proxy_buffering off;
fastcgi_buffers 64 4K;
- Add this for disable buffering of responses to temporary files
fastcgi_max_temp_file_size 0;
PHP-FPM configuration :
Change request_terminate_timeout value from 45s to 3600s
request_terminate_timeout = 3600s
After that, restart php-fpm and nginx and this is how i solved my problem !