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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@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

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