in reply to Re: HTML5, SSE, flush output '$| = 1' not working as expected
in thread HTML5, SSE, flush output '$| = 1' not working as expected

Thanks Corion, you brougth me on the way of success. Turning off mod_deflate in the Apache2 configuration was the key.

a2dismod deflate apache2 restart

The module mod_deflate does the buffering. Turning that module of will provide updates with the Perl-Environment every second as expected.