Progress webpage fails to load in non-server mode

[tennix]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do? If possible, provide a recipe for reproducing the error.

Deploying tidb-lightning using k8s via pingcap/tidb-operator#817

git clone https://github.com/tennix/tidb-operator -b tidb-lightning
cd tidb-operator
helm install charts/tidb-cluster -n <cluster-release-name> --namespace <namepsace> --set importer.create=true
helm install charts/tidb-lightning -n <lightning-release-name> --namespace <namespace> --set dataSource.local.nodeName=<node-name>,dataSource.local.hostPath=<host-path>,targetTidbCluster.name=<cluster-release-name>

Then view the lightning service

2. What did you expect to see?

The web page shows the task progress correctly.

3. What did you see instead?

The page shows and disappears immediately.

4. Versions of the cluster

The version of the cluster is v3.0.1. The corresponding images are pulled from DockerHub.