I guess that Apache will try to parse your headers and thus waits until your script exits.

I would investigate on whether you need to output a HTTP status line to make Apache ignore your output or if you need to configure Apache differently ("non-parsed headers", NPH).

In general, Server-Sent Events work, as I've written a Dancer/Plack application HTTP::ServerEvents. If you're not tied to Apache, maybe you can run this or Plack::App::EventSource by vti.

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

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