Ingress router PathRewriteRegex Issue

Traefik Traefik v2
,
1

Hi there I'm trying to achieve following:

Requests are coming from *.mysite.com, let's say joseph.mysite.com.

I'm handling these request with lowest priority rule in K8s ingress file.

I want to add a Traefik middleware to extract subdomain and add it to URI path.
Example, https://joseph.mysite.com/studies should path rewrite as https://profiles.mysite.com/joseph/studies when request is sent to pod.

One thing to note, I do not want to redirect request. However, I want to modify request path so that application can correctly handle it.

Currently, I have below K8s Traefik ingress rules.

apiVersion: traefik.containo.us/v1alpha1
kind: IngressRoute
metadata:
  labels:
  # {{ include "app.resource_labels" . | indent 4 }}
  name: '{{ .Release.Name }}'
spec:
  routes:
        - kind: Rule
      match: HostRegexp(`{subdomain:[a-zA-Z0-9-]+}.mysite.com`)
      middlewares:
        - name: 'test-profile'
      priority: 1
      services:
        - kind: Service
          name: '{{ .Release.Name }}'
          namespace: testproject
          port: 80

and middleware as below:

Try #1

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  labels:
  # {{ include "app.resource_labels" . | indent 4 }}
  name: 'test-profile'
spec:
  replacePathRegex:
    regex: '(http)(.*)://?([^.]+)(\.)?mysite.com(/.*)'
    replacement: /${3}

Try #2

apiVersion: traefik.containo.us/v1alpha1
kind: Middleware
metadata:
  labels:
  # {{ include "app.resource_labels" . | indent 4 }}
  name: 'test-profile'
spec:
  replacePathRegex:
    regex: '(http)(.*)://?([^.]+)(\.)?mysite.com(/.*)'
    replacement: '${1}s://profiles.mysite.com/${3}${5}'

However, none of the above middleware rules seem to work.

If I try same rules with RedirectRegex it works so I was hoping RewritePathRegex do something similar but without redirecting request url.

Is there a way to achieve this where subdomain can be passed as path to destination pod?

2

The replacePathRegex middleware only operates on the path portion of the URI, so to do it this way I do believe you would need to use a redirect first.

I will point out that any request will be getting the Host header set along with X-Forwarded-For among others that will server better for your app request handling.

3

Thank you very much for replying to this question.
After spending much time, I'm leaning towards the suggestion you mentioned.
Trying out X-Forwarded-Host at application level and if I can access subdomain there instead of handling at traefik level. Will post an update here shortly.