PHP Flush that works… even in Nginx

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The easiest way to eliminate nginx’s buffering is by emitting a header:

header('X-Accel-Buffering: no');

This eliminates both proxy_buffering and (if you have nginx >= 1.5.6), fastcgi_buffering. The fastcgi bit is crucial if you’re using php-fpm. The header is also far more convenient to do on an as-needed basis.

Docs on X-Accel-Buffering
Docs on fastcgi_buffering

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