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Accepted
Peter Smit
Asked: 2011-08-03 11:20:27 +0800 CST

Comet with uwsgi and nginx, how to turn off the output buffer?

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How can I prevent Nginx from buffering the output of my uwsgi app? For my comet style application I'm using long polling and the requests are now buffered.

I tried to reduce the size of the buffers, but I'm not allowed to put uwsgi_buffer_size and uwsgi_buffers on 0. Also uwsgi_max_temp_file_size does not work (eventhough the manual suggests that).

How can I do this?

nginx buffer uwsgi

4 Answers

  1. Best Answer

    Until a few minutes ago this was not possible. nginx would always buffer all uwsgi and scgi responses, and no configuration would change that.

    I have submitted a patch for nginx (and it was accepted) and from the next version on there are two methods to disable buffering for uwsgi requests:

    • put uwsgi_buffering off in the nginx config
    • send a X-Accel-Buffering 'no' header in the response

    uwsgi never buffers the response, so no configuration is required on that end.

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  2. Why don't you use the uwsgi-embedded http-router/load-balancer directly ? It does no-buffering expecially for comet/websockets app. You can use nginx for static files mapping them to another domain.

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  3. Try with uwsgi_max_temp_file_size = 0

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  4. Nginx "proxy" module has a directive for that, it's called proxy_buffering on|off, which does exactly what you want, it turns buffering off and proxies upstream output synchronously. But AFAIK neither FastCGI nor UWSGI modules have it.

    BTW even when proxy_buffering is off, you may notice small delays because of OS TCP stack buffering.

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