YAML syntax for default 'route' to catch all domains?

Traefik Traefik v2
2

This has been recommended by a maintainer (post):

HostRegexp(`.+`)

Make sure to use Traefik v3.

Note that the rule may be longer than domain only, at least in Docker rules are prioritized by length. So you might need to set a lower priority (number), for catchall to be matched last.