Subject: Re: bug#77503: 30.1; eww does not fall back to ipv4 if ipv6 is not working

From: Robert Pluim <[email-masked]>
Date: Fri, 04 Apr 2025 10:00:21 +0200

>>>>> On Thu, 03 Apr 2025 20:37:39 +0200, Francesco Potortì <[email-masked]> said:

    Francesco> Subject: wget: does not fall back ti ipv4 if ipv6 does not work
    Francesco> X-Debbugs-CC: Francesco Potortì <[email-masked]>
    Francesco> Fcc: ~/Mail/backup/SMAIL
    Francesco> --text follows this line--
    Francesco> If a target has both an ipv6 and an ipv4 address, Eww uses ipv6 as
    Francesco> usual.  But if ipv6 connectivity is broken, Eww does not fall back to
    Francesco> ipv4, while it should.  Following is an example situation that I can
    Francesco> observe here where Eww fails.

This is a generic problem with all network connection functionality in
Emacs. Weʼd need to implement something like Happy Eyeballs (RFC
8305), which would need support from the C core.

Robert
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