In our Kubernetes Cluster, We have a requirement to do a string replace in our Response body. Is there such a thing in Istio for response content modification. I could only find header manipulation.
Can Nginx Ingress Controller do this?
The respone contains html content with hrefs as: <>"/static/myimages/logo.png"<> We would like to modify this response to prefix it with <>"/myapp/static/myimages/logo.png"<>
Does anyone have a recommendation for a gateway that can do this content rewrite. Do you have samples to share?
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: resource-manager
spec:
hosts:
- "*"
gateways:
- myapp-gateway
http:
- match:
- uri:
prefix: /myapp/
rewrite:
uri: "/"
route:
- destination:
host: myapp.voting.svc.cluster.local
port:
number: 9099
headers:
response:
add:
foo: barAFAIK, istio does not offer body modification by default. It might not even be possible with custom envoy filters.
I started looking at other Ingress Controllers and found that NGINX-Ingress can do response manipulation. Here is an ingress route I setup which does content manipulation. Sharing that here:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: app1-ingress
namespace: app1
annotations:
nginx.ingress.kubernetes.io/configuration-snippet: |
sub_filter '<title>My title' '<title>My updated title'; #This changes title that Chrome Shows on Top
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/ssl-redirect: "false"
nginx.ingress.kubernetes.io/rewrite-target: /$1
spec:
rules:
- http:
paths:
- backend:
serviceName: app1
servicePort: 8080
path: /app1/(.*)