Fixed pod logs core api request errors.

[homer6]

1. This fix drops the text/plain header as it was causing the requests to fail entirely.
2. This fix also moves the strdup inside the guard to prevent segfaults on null dataReceived (which I experienced and traced with gdb).

This fix is for issue #222

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[ityuhui]

/hold

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@k8s-triage-robot: Closed this PR.

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