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Abraham Vegh
Asked: 2013-03-18 23:08:22 +0800 CST

How do I enable PHP’s flush() with nginx+PHP-FPM?

  • 772

I’m using nginx with PHP-FPM (APC is installed).

I need PHP’s flush() to work. Is this possible?

Things I’ve tried so far:

  • Disabling all output buffering in php.ini, as well as output compression.
  • Disabling gzip in nginx’s configuration.
  • Setting nginx’s fastcgi_* buffering settings and fastcgi_max_temp_file_size to zero.

I’m sure I must be missing something, since I’ve run across many posts here and elsewhere where people claimed they’ve got it working, but I’m having no luck, it would seem.

php

4 Answers

  1. Best Answer

    Sadly it's not possible with nginx. The nginx implementation of fastcgi requires a buffer to be in place, even if you set the buffering directive to 0 it will just cause it to buffer to disk instead of memory.

    You'll have to figure out some alternative system such as a queue where you can poll for the status. (think ala gearman for instance)

    Edit: This is since possible: http://nginx.org/en/docs/http/ngx_http_fastcgi_module.html#fastcgi_buffering

    • 4

  2. I wanted the same thing, and it turns out it is possible. All you need is this before anything is echo'ed:

    header('Content-Encoding: none;');

    Then to flush you do the flush as normal:

    ob_end_flush();
flush();

    Nginx seems to pick up on the encoding having been turned off and doesn't gzip.

    • 3

  3. It's possible. Put this in the server section of your site's config file:

    gzip off;
proxy_buffering off;
fastcgi_keep_conn on;
fastcgi_max_temp_file_size 0;
fastcgi_buffering off;

    Put this in php.ini

    output_buffering = Off
implicit_flush = On

    Be careful. Disabling these buffers can have severe performance implications.

    • 3

  4. It IS possible, look at this answer.

    I tried it myself and it works.

    Upgrade your nginx server {} config:

    fastcgi_keep_conn on; # < solution

proxy_buffering off;
gzip off;
    • 0