What does HRESULT 0x80072EFB (WININET_E_INCORRECT_FORMAT) mean?

 
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WININET_E_REQUEST_PENDING WININET_E_ITEM_NOT_FOUND

WININET_E_INCORRECT_FORMAT

WININET_E_INCORRECT_FORMAT is a WinINet HRESULT. It means that a request value, header, option buffer, or other information block does not use the format expected by WinINet.

What to check

  • Validate the exact input being passed to the failing API, including encoding, terminators, delimiters and structure layout.
  • Check the documentation for the expected format instead of reusing data prepared for a different WinINet function.
  • Log safe diagnostics such as field names and lengths, not credentials or complete authorization headers.

Microsoft: WinINet overview


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