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Re: [EXTERNAL] Re: Feature request: provide ability to set a global callback function telling libcurl if IPv6 works on the system

From: Dan Fandrich via curl-library <>
Date: Wed, 21 Sep 2022 18:21:08 -0700

On Thu, Sep 22, 2022 at 12:24:57AM +0000, Dmitry Karpov via curl-library wrote:
> > If Curl_ipv6works() were not called in the CURL_IPRESOLVE_V6 case, would
> > that solve the issues that are remaining?
> Your question was:
> "So, if libcurl eliminated that call in the CURL_IPRESOLVE_V4 case, would it fix your problem?"

That was my previous question. The question above refers to CURL_IPRESOLVE_V6.

> YES, adding a callback doesn't fix anything on its own. But it allows curl applications to work around problems/regressions caused by default Curl_ipv6works() behavior.

I'm betting that this problem can be fixed without adding a new callback,
especially one that goes against the way libcurl works, namely that callbacks
are used to change behaviour during a transfer.

Received on 2022-09-22