bug#22215: guix package fails to use more than the first substitute server in case of 404 failure

[Maxim Cournoyer]

Hello!

Florian Paul Schmidt <address@hidden> writes:

> guix package --substitute-urls="http://fps.io:9999
> http://hydra.gnu.org"; -i emacs
>
> fails due to
>
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21888
>
> with a 404 and consequently fails to try hydra for the download after
> the download from fps.io failed.
>
> Regards,
> Flo

I couldn't reproduce the 404 error with the above command, however there
is still a problem because it is hanging with no sign of timing out. I
canceled it with C-c.

Maxim