Try adding an additional ingress with no host

apps/whoami/ingress.yaml

@@ -9,6 +9,35 @@ spec:
   - match: Host(`podinfo.k3s`)
     kind: Rule
     services:
+    - name: podinfo
+      namespace: apps
+      kind: Service
+      port: 9898
+---
+apiVersion: traefik.io/v1alpha1
+kind: Middleware
+metadata:
+  name: podinfo-strip
+  namespace: apps
+spec:
+  stripPrefix:
+    prefixes:
+      - /podinfo
+---
+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: podinfo
+spec:
+  entryPoints:
+    - web
+  routes:
+  - match: PathPrefix(`/podinfo`)
+    kind: Rule
+    middlewares:
+    - name: podinfo-strip
+      namespace: apps
+    services:
     - name: podinfo
       namespace: apps
       kind: Service