Plesk mod_fcgid + php flush() function enable

I set following option in /etc/httpd/conf.d/fcgid.conf file which solves the problem generally (but it would not when Plesk is installed):
OutputBufferSize 0

Try to configure OutputBufferSize option for the exact domain, for this create vhost.conf file
in domain document root (usually /var/www/vhost/domain.tld/conf folder), add OutputBufferSize
option with necessary value there and run

/usr/local/psa/admin/sbin/websrvmng -a -v

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