What does HRESULT 0x8019019B (HTTP_E_STATUS_LENGTH_REQUIRED) mean?

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The server returned HTTP 411 Length Required and requires a defined request content length.

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HTTP_E_STATUS_GONE	HTTP_E_STATUS_PRECOND_FAILED

HTTP_E_STATUS_LENGTH_REQUIRED

HTTP_E_STATUS_LENGTH_REQUIRED maps to HTTP 411 Length Required. The server refuses to accept the request without a defined Content-Length.

Verify whether the client sends Content-Length, chunked transfer coding, or no body at all.
Check that proxies do not remove or alter body framing headers.
For a known-size payload, send the correct content length; for streaming uploads, confirm that the endpoint supports the framing selected by the client.