HRESULT 0x80072F77 (WININET_E_DOWNLEVEL

Status / error code:

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Constant name:

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Description:

The server did not return the expected HTTP headers.

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WININET_E_HEADER_NOT_FOUND	WININET_E_INVALID_SERVER_RESPONSE

WININET_E_DOWNLEVEL_SERVER

WININET_E_DOWNLEVEL_SERVER is a WinINet HRESULT. It means that WinINet received a response from a server that did not provide headers in the format required for the requested HTTP operation. This can indicate an old, non-HTTP, malformed, intercepted, or incomplete server response.

What to check

Capture the raw response status line and headers with safe diagnostics to confirm what the server actually returned.
Verify the target URL, proxy and protocol selection so an HTTP request is not sent to a non-HTTP endpoint.
Check intermediaries such as reverse proxies and TLS inspection devices for truncated or rewritten responses.

Microsoft documentation

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