Problem running nginx in a container

[marioja2]

It just dawned on me that the difference between the case where result is
attachment and the case with result is error code is most likely related to
the application reacting to a difference in the environment. Maybe a file or
folder permission. I did check both directory tree and could not see a
difference. I will look at the code.

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,293592,293620#msg-293620