Backend response "204 Not Content" and the proxy not finish the request

[canonale]

I'm using the nginx-proxy with a Piwik's container. Piwik gives me statistics about one DonDocker.

For this, Piwik uses a GET request for /piwik.php to save the statistics. This request response with 204 Not Content. If I use this software directly all run ok but if I use the proxy NginX, it remains waiting for the response but not finish.

I changed the code, 204 to 200 and the system go on.

Can I change the proxy configuration to process response's 204 from backend?

This is the command:

>_ docker run -d -p 80:80 -v /var/run/docker.sock:/tmp/docker.sock