It would return a status code the resolver returns when it performs a DNS query.

For instance, c-ares passes its status code in resolution callbacks, so this 
status code would be returned in the CURLINFO_RESOLVER_CODE.
So, if something goes wrong with host name resolution, this code will give a 
hint why the resolver failed.


-----Original Message-----
From: Daniel Stenberg <dan...@haxx.se> 
Sent: Sunday, April 17, 2022 2:56 AM
To: Dmitry Karpov via curl-library <curl-library@lists.haxx.se>
Cc: Dmitry Karpov <dkar...@roku.com>
Subject: Re: Feature request about curlinfo option returning resolver 
status/error code

On Fri, 15 Apr 2022, Dmitry Karpov via curl-library wrote:

> So, I propose to add a new CURLINFO_RESOLVER_CODE info option, which 
> will return the resolver status/code from the resolver backends that 
> provide such codes (primarily c-ares).
>
> If libcurl core maintainers and community agree that it will be a 
> useful feature, I can create a PR.

What values do you propose CURLINFO_RESOLVER_CODE would return ?

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