Default router with Traefik

Question

I would like to route traffic on HTTP Headers with Traefik. In case there is no matching rules, I need to route to another service or return a custom status code (426). Is it possible to configure default case for rules ?

apiVersion: traefik.containo.us/v1alpha1 
kind: IngressRoute 
metadata: 
  name: headers 
spec: 
  entrypoints: 
    - web 
    - websecure 
  routes: 
    - match: Headers(`X-ROUTE`,`Apache`) 
      kind: Rule 
      services: 
        - name: apache 
          port: 80 
    - match: Headers(`X-ROUTE`,`nginx`) 
      kind: Rule 
      services: 
        - name: nginx 
          port: 80
    - else ??

Answer 1

You can add this case to match anything with the lowest priority which is 1.

- match: HostRegexp(`{catchall:.*}`)