CURLOPT_DEBUGFUNCTION.3: warn about internal handles #12034
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- Warn that the user's debug callback may be called with the handle parameter set to an internal handle. Without this warning the user may assume that the only handles their debug callback receives are the easy handles on which they set CURLOPT_DEBUGFUNCTION. This is a follow-up to f8cee8c which changed DoH handles to inherit the debug callback function set in the user's easy handle. As a result those handles are now passed to the user's debug callback function. Closes #xxxx
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Without this warning the user may assume that the only handles their debug callback receives are the easy handles on which they set CURLOPT_DEBUGFUNCTION.
This is a follow-up to f8cee8c which changed DoH handles to inherit the debug callback function set in the user's easy handle. As a result those handles are now passed to the user's debug callback function.
Closes #xxxx
I did not mention DoH specifically in case we want to expand on it later, like for example in the future we may want to make the connection closure internal handle inherit the user's debug function and verbosity. (See #11878)