Below is my manifests:

• service.yaml

apiVersion: v1
kind: Service
metadata:
  name: jenkins
spec:
  type: NodePort
  ports:
   - port: 8080
     protocol: TCP
     targetPort: 8080
     nodePort: 80
  selector:
    app: jenkins
  #externalTrafficPolicy: "Cluster"

• ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: nginx-ingress-entry
  annotations:
    kubernetes.io/ingress.class: "nginx"
    #nginx.ingress.kubernetes.io/ssl-redirect: "true"
    nginx.ingress.kubernetes.io/rewrite-target: /
    #ingress.bluemix.net/rewrite-path: "serviceName=jenkins rewrite=/"

spec:
  tls:
  - hosts:
    - ingress.hygon.cn
    secretName: nginx-cert
  rules:
  - host: ingress.hygon.cn
    http:
      paths:
      - path: /jenkins
        backend:
          serviceName: jenkins
          servicePort: 8080

I use an nginx ingress to control access backend service Jenkins. If I set http.paths.path equal "/" everything works well, but if I set path field for the URL the browser will show a 403 error.