Strip part of URI

In addition to the strip_path=true/false option we need to strip only a part (prefix) of the path.
I’d suggest an option like strip_path_prefix="/some-text".
The use case is having a single service with multiple routes attached which allow different consumers, for example:

  • /route - strip_path=true, allow consumer1
  • /route/health - strip_path_prefix="/route", allow consumer2

Such rewrites are basic Nginx functionality so it shouldn’t be hard to implement.
I have seen quite a few people asking for this feature, eg:
https://discuss.konghq.com/t/service-with-two-strip-path-routes/2596
https://discuss.konghq.com/t/strip-part-of-a-path-prefix-when-routing/1940
https://discuss.konghq.com/t/strip-some-part-of-uri/735

Appreciate any reaction,
thanks Pavel

17 Likes

This would be really useful for us as well

3 Likes

+1 Agreed would find this helpful also

2 Likes

yes please i am looking for same functionality

They already have a plugin request-transformer-advanced to handle such case. Although it only available with Enterprise subscription.

But anyway, really looking forward to have such strip_path_prefix to be available for all. Otherwise we have to create much more services and routes for the case…

It would be very useful for us.

Waiting for that feature as well.

Any update regarding this feature?

This would be very usefull. Our organization is depending on namespacing Service’s for every team, and thus this “team namespace” would be very nice if could be easily removed while preserving the rest of the path.

Meanwhile it seems this community plugin does a good job: https://github.com/alexashley/kong-plugin-path-prefix

Or it should be possible to do it with the request-transformer Kong plugin, using config.replace.uri and regex:

config.replace.uri=your-prefix/(\w+):$(uri_captures[1])
1 Like

Since it took me a while to figure things out, I thought sharing my solution might help

For the record, I had the same problem, I end up using:

Full example with Kong Ingress Controller

apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: strip-demo-2-path-prefix
config:
  path_prefix: "/foo/"
plugin: path-prefix
---
apiVersion: configuration.konghq.com/v1
kind: KongPlugin
metadata:
  name: set-forwarded-header
plugin: post-function
config:
  access:
    - |
      ngx.var.upstream_x_forwarded_prefix='/foo'
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: demo-2
  annotations:
    konghq.com/strip-path: "false"
    konghq.com/plugins: strip-demo-2-path-prefix,set-forwarded-header
spec:
  ingressClassName: kong
  rules:
  - http:
      paths:
      - backend:
          service:
            name: echo
            port:
              number: 80
        path: /foo/bar
        pathType: ImplementationSpecific

With this solution:

  • Requests to /foo/bar are captured by Kong
  • They are routed to the upstream service to the path /bar
  • The forwarded request has the header X-Forwarded-Prefix: /foo (which makes the upstream service able to find out what its external url is)
1 Like