Nginx ingress rule for changing path on the fly - nginx

Question

I would like to change the path of request coming to ingress-nginx on the fly to match what different backend services expect. For example, imagine these are the two services I have got:
foo service:
http://foo:8080/api/v1
bar service:
http://bar:8080/api/v1
I would like to expose foo service as http://test.com/foo/api and bar service as http://test.com/bar/api. However, I am not sure how I can change the path on the fly to match what the underlying service expects.
Example ingress.yaml file:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: test-ingress
spec:
rules:
- host: test.com
http:
paths:
- path: /foo/api/
backend:
serviceName: foo
servicePort: 8080
- path: /bar/api
backend:
serviceName: bar
servicePort: 8080
- path: /
backend:
serviceName: ui
servicePort: 80

Answer 1

You can try with rewrite annotations.
Look at the example provided in this documentation:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$2
name: rewrite
namespace: default
spec:
rules:
- host: rewrite.bar.com
http:
paths:
- backend:
serviceName: http-svc
servicePort: 80
path: /something(/|$)(.*)
In this ingress definition, any characters captured by (.*) will be assigned to the placeholder $2, which is then used as a parameter in the rewrite-target annotation.
For example, the ingress definition above will result in the following rewrites:
rewrite.bar.com/something rewrites to rewrite.bar.com/
rewrite.bar.com/something/ rewrites to rewrite.bar.com/
rewrite.bar.com/something/new rewrites to rewrite.bar.com/new
Just adjust the path and other variables with your data.
Please let me know if that helped.