Cherrypick - fix: all big enough ui proxy requests fail with error proxying with p…

[jingzhang36]

…artial data (#4266)

• fix: all big enough ui proxy requests fail with error proxying with partial data

• Fix naming

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[k8s-ci-robot]

@jingzhang36: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
kubeflow-pipeline-sample-test	d7117dc	link	/test kubeflow-pipeline-sample-test
kubeflow-pipeline-e2e-test	d7117dc	link	/test kubeflow-pipeline-e2e-test
kubeflow-pipeline-upgrade-test	d7117dc	link	/test kubeflow-pipeline-upgrade-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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