php server side events [sse]

dmiller at dmiller at
Wed Aug 26 23:53:31 UTC 2015

I thought I had done both...not seeing any difference in behaviour.


On 2015-08-26 14:08, Maxim Dounin wrote:
> Hello!
> On Wed, Aug 26, 2015 at 12:33:48PM -0700, dmiller at wrote:
>> I have several virtual servers operating with php-fpm perfectly fine.
>> Buffering/caching with Wordpress is great.  But now...
>> I'm trying to implement a new site that uses php for server-side 
>> events to
>> stream live updates to clients.  This is, I believe, properly done 
>> with an
>> infinite loop in php that will send events as they occur.  The problem 
>> is
>> the events seem to be getting buffered and don't appear.
>> If I write the php program to end after sending an event then it 
>> works.  If
>> I restart php-fpm then it works - at least for a while.
>> I've tried numerous config options - obviously what I'm trying isn't
>> working.  Any suggestions?
> By default, nginx only starts sending data to a client once it has
> a full buffer ready.  If you want to stream data immediately,
> you have to switch off buffering - either with the fastcgi_buffering
> directive, or using the X-Accel-Buffering header in a response.
> See for details.
> Additionally, there are some buffering option in PHP.  I'm not a
> PHP expert, but likely flush() function will help if the problem
> is on PHP side, see

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