How to log the number of bytes sent over a websocket?

Sergey Kandaurov pluknet at
Mon Jun 25 12:04:58 UTC 2018

> On 22 Jun 2018, at 16:38, Fabrice Triboix <ftriboix at> wrote:
> Hi All,
> I am using nginx as a websocket reverse-proxy (this is working fine BTW). I would like to log the number of bytes sent (and ideally also received) over a websocket. If I use `$body_bytes_sent` in `log_format`, the entry in the access_log is always 0. As far as I can tell, a lot of data went through the websocket, so clearly `$body_bytes_sent` does not include data sent over a websocket.
> [..]

Make sure to run a recent enough version of nginx, at least 1.7.11.

Sergey Kandaurov

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