This is what I see in /var/log/ovirt-imageio-daemon/daemon.log.
020-01-03 16:54:03,176 INFO (Thread-1) [http] OPEN client=local
2020-01-03 16:54:03,178 INFO (Thread-1) [tickets] [local] ADD ticket={u'uuid':
u'f1baa082-393a-47af-8165-09b0cc9913eb', u'ops': [u'write'],
u'url':
u'file:///rhev/data-center/mnt/_vmisos/d9a3e101-7cfe-446f-8ae8-13fac321ae2c/images/0217c498-9aa9-45f4-9964-6edce9e2817f/d8e80353-f409-4cd1-80fc-9546b3fd09fe',
u'sparse': True, u'timeout': 300, u'transfer_id':
u'5984405b-da3b-4ae4-99e9-ccec1556f213', u'size': 942407680}
2020-01-03 16:54:03,179 INFO (Thread-1) [http] CLOSE client=local
[connection=0.002770/1, dispatch=0.000466/1]