On Mon, 22 Jan 2018, John Hascall via curl-library wrote:
I would like to suggest that returning some sort of error like CURLE_NO_IPV6_SUPPORT (or at least CURLE_NOT_BUILT_IN ) would be more helpful.
Thanks for your report. This is clearly an oversight on our behalf.Together with a helpful message in the ERRORBUFFER I think the existing CURLE_NOT_BUILT_IN return should be good enough.
However, it is not clear to me whether this should happen on the curl_easy_setopt (CURLOPT_CONNECT_TOO ) call or on the curl_easy_perform() call.
Typically the setopt() call is mostly just a set operation so the data isn't actually used or parsed until perform() is called and that's the case for this option. curl_easy_perform() will then be the function that returns an error for this.
-- / daniel.haxx.se
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