traefik.ingress.kubernetes.io/rewrite-target didn't work as expected in k8s

[niexiongfang]

actually reopen #3494 for my case the rewrite-target was not the root ('/'), which cannot be workaround by PathPrefixStrip

Do you want to request a feature or report a bug?

Bug

What did you do?

I try to replace nginx-ingress with traefik-ingress on k8s. And I find that rewrite-target has a strange behavior.

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: traefik
    traefik.ingress.kubernetes.io/rewrite-target: /demo
  name: traefik-test
spec:
  rules:
  - host: <traefik-domain>
    http:
      paths:
      - backend:
          serviceName: tomcat-service
          servicePort: 8080
        path: /qwe/asd
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/rewrite-target: /demo
  name: nginx-test
spec:
  rules:
  - host: <nginx-domain>
    http:
      paths:
      - backend:
          serviceName: tomcat-service
          servicePort: 8080
        path: /qwe/asd
send request
http://<traefik-domain>/qwe/asd/api?token=12345
http://<nginx-domain>/qwe/asd/api?token=12345

What did you expect to see?

nginx:
backend recieve "GET /demo/api?token=12345 HTTP/1.1"

What did you see instead?

traefik:
backend recieve "GET /demo HTTP/1.1"

Output of traefik version: (What version of Traefik are you using?)

traefik:1.6.3
nginx-ingress-controller:0.15.0

[traefiker]

Closed by #3582.