How to rewrite the last prefix (/index.html) at the end of url in Istio VirtualService?

Question

I need to get rid of index.html at the end of url, so
https://somehost/somepath/index.html
is rewritten to
https://somehost/somepath

I tried

  - match:
    - uri:
        regex: (.*)\/index.html
    route:
    - destination:
        host: allure-service-clusterip.allure-docker-service.svc.cluster.local
        port:
          number: 7070
    rewrite:
      uriRegexRewrite:
        match: (.*)\/index.html
        rewrite: /\1

and

- match:
  - uri:
      prefix: /index.html
  route:
  - destination:
      host: allure-service-clusterip.allure-docker-service.svc.cluster.local
      port:
        number: 7070
  rewrite:
      uri: /

but it does not work.

Originally it was implemented with nginx ingress as following:
https://github.com/fescobar/allure-docker-service-examples/blob/master/allure-docker-kubernetes-example/allure-ingress-service-load-balancer.yml

Any ideas?

Answer 1

To get rid of index.html at the end of your URL using Istio Virtual Service, you can use the rewrite field with a regular expression. Here's a config that should do the trick:

apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
  name: allure-virtual-service
spec:
  hosts:
  - "*"
  gateways:
  - your-gateway-name
  http:
  - match:
    - uri:
        regex: ^(.*/)index.html$
    rewrite:
      uri: "$1"
    route:
    - destination:
        host: allure-service-clusterip.allure-docker-service.svc.cluster.local
        port:
          number: 7070

Here's what's going on:

1. The match section uses a regular expression ^(./)index.html$ to match URLs that end with /index.html. The (.) captures the path before /index.html.

2. The rewrite section rewrites the URI using the captured group from the match. The uri field is set to "$1", which replaces the matched URI with the captured path, effectively removing /index.html from the end.

3. The route section specifies where the request should be sent, which is the allure-service-clusterip service in the allure-docker-service namespace.

Don't forget to replace your-gateway-name with the actual name of your Istio Gateway. With this setup, requests to https://somehost/somepath/index.html will be rewritten to https://somehost/somepath and sent to the specified destination service.