* webclient.Ping: Return err on unsuccessful response
* Log mangled response, add test case
* Point towards possible causes of errors
Co-authored-by: Krzysztof Skrzętnicki <krzysztof.skrzetnicki@goteleport.com>
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Co-authored-by: Krzysztof Skrzętnicki <krzysztof.skrzetnicki@goteleport.com>