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  WinHTTP Questions: About Callbacks
Time: 00:44 EST/05:44 GMT | News Source: Microsoft | Posted By: Kenneth van Surksum

Is it correct that WinHTTP Callbacks will occur *only* during an in-progress WinHTTP operation? Is it possible that an external event (such as the remote server resetting the underlying tcp connection) result in a callback even when there's no outstanding operation?

No. For external callbacks, WinHTTP will indicate informational callbacks only when there is a pending operation. Essentially, there are two types of callbacks in WinHTTP. Completion callbacks and Informational callbacks.

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