Edit: /etc/dnf/plugins/copr.conf (351B)
[fedora]
hostname = copr.fedorainfracloud.org
protocol = https
port = 443
# To add another Copr hub, make a new section with its hostname, protocol and port.
# (protocol and port are optional and their default values are `https` and `443` respectively).
# [name-of-hub]
# hostname = hub-hostname
# protocol = https (optional)
# port = 443 (optional)