What does HRESULT 0x80072EFB (WININET_E_INCORRECT_FORMAT) mean?

Status / error code:

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Constant name:

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Description:

Information supplied to WinINet has an incorrect format.

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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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