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WININET_E_NOT_INITIALIZED
WININET_E_NOT_INITIALIZED means that the required WinINet initialization has not occurred. Microsoft documents this as a sign that a higher-level initialization function, such as InternetOpen, has not been called.
Typical implementation causes
- Calling a request or option API before the session handle is created.
- Destroying the session owner while a lower-level wrapper remains reachable.
- Using a library from static initialization, process shutdown, or a background thread after the owning subsystem has stopped.
How to prevent it
Make the session lifetime explicit and require a valid initialized owner before creating connection or request handles. For a long-running service, prefer the API designed for services rather than using WinINet outside its intended interactive-client model.
Microsoft: WinINet error messages · Microsoft: About WinINet
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