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Issue description: 

 I deleted and started a fresh lab today. Ran this lab Fresh. Also Finished the Lab and Rebuilt it to troubleshoot.

At Step 5.2 Command to upload data to Data Volume errors below. Will not complete Image-Upload. Keeps Erroring out.

Post "https://cdi-uploadproxy-openshift-cnv.apps.ocp4.example.com/v1alpha1/upload-async": write tcp 172.25.250.9:39448->192.168.50.254:443: use of closed network connection

Managing Virtual Machines with Red Hat OpenShift Virtualization
Chapter 6: Create and Restore Backups of Virtual Machines

Guided Exercise: Export and Import Virtual Machine Data and Settings

Step 5.2:
virtctl image-upload dv mariadb-server --image-path mariadb-server-pvc.img --size 10Gi
PVC backup-vm/mariadb-server not found 
DataVolume backup-vm/mariadb-server created
Waiting for PVC mariadb-server upload pod to be ready...
Pod now ready
Uploading data to https://cdi-uploadproxy-openshift-cnv.apps.ocp4.example.com

 421.41 MiB / 919.80 MiB [======================================================================================================>------------------------------------------------------------------------------------------------------------------------] 45.82% 3m19s

Post "https://cdi-uploadproxy-openshift-cnv.apps.ocp4.example.com/v1alpha1/upload-async": write tcp 172.25.250.9:39448->192.168.50.254:443: use of closed network connection 

Steps to reproduce:

Workaround:

Expected result: