/usr/share/metview/etc/MARS_webapi is in metview-data 5.0.0~beta.1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #---------------------------------------------------------- MARS_webapi
#
# Only MARS access through the Web API is configured
#
#--------------------------------------------------------------------
cat $METVIEW_DIR_SHARE/etc/marsdb.webapi.cfg
|