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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.
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