Apache / nGinx to add
•
max_input_vars = 5000
Add to PLESK in nGinx additional settings :
512
proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
and if the server/domain uses FASTcgi :
fastcgi_buffers 16 16k;
fastcgi_buffer_size 32k;