ERROR_WINHTTP_CANNOT_CALL_BEFORE_OPEN

Returned by the [**HttpRequest**] object if a requested operation cannot be performed before calling the [**Open**] method.

Matched as: the code as given (hex)

Source: WinHTTP Error Messages · CC-BY-4.0 (MicrosoftDocs/sdk-api, repo license verified 2026-10-09) · retrieved 2026-10-09