[CentOS] "UMask=0002" ignored in httpd service file

Thu Aug 20 16:54:01 UTC 2015
Dennis Jacobfeuerborn <dennisml at conversis.de>

Hi,
I'm trying to get Apache httpd to create new files with the group
writable bit set and thought adding the directive "UMask=0002" to the
service section of the service file would be enough (after copying it to
/etc/systemd/system). But after a systemctl daemon-reload followed by a
service restart files are still created as "-rw-r--r--" instead of the
expected "-rw-rw-r--".
Does anyone have an idea what is missing here or how I can debug why the
directive is apparently ignored?

Regards,
  Dennis