Level 2

Manipulating path while routing the request through vpn configurations

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Hi Community,

I want to define a rule in the cdn.yaml using the origin selector as described in the documentation https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/implementing/content-delivery/cdn-configuring-traffic#origin-selectors that would route the traffic for a particular path to an external website (www.website.com).

Something similar to

originSelectors:  rules:    - name: blogs      when:        allOf:          - reqProperty: tier            equals: publish          - reqProperty: domain            equals: <our domain>          - reqProperty: path            matches: "^/en-us/prefix/.*"

However, prior the routing I want to manipulate the path, so the /prefix part is eliminated and for the /en-us/prefix/page path it would send a request to www.website.com/en-us/page.

We have this logic working at the dispatcher tier using the ProxyPass directive. I am trying to understand if the same logic can be handled at the cdn level.

Regards,

Rustam

Experience Manager Sites

konstantyn_diachenko

Community Advisor

Hi @user62746 ,

Personally, I don’t know how can we achieve it on CDN level, because the originSelectors don’t provide request transformation capabilities so far according to the documentation.

There is another workaround with redirect, but, apparently, it doesn’t fit you. You can have a try.

kind: "CDN"
version: "1"
metadata:
  envTypes: ["dev", "stage", "prod"]
data:
  redirects:
    rules:
      - name: redirect-with-prefix-to-new-domain
        when:
          allOf:
            - { reqProperty: tier, equals: "publish" }
            - { reqProperty: domain, in: [ "www.example.com", "www.example.com" ] }
            - { reqProperty: path, matches: "^/en-us/prefix/.*" }
        action:
          type: redirect
          location:
            reqProperty: url
            transform:
              - op: replace
                match: '^(/en-us)/prefix(/.*)'
                replacement: 'https://www.example.com/\1\2'

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Kostiantyn Diachenko, Community Advisor, Certified Senior AEM Developer, creator of free AEM VLT Tool, maintainer of AEM Tools plugin.

U

user62746Author

Level 2

Hi @konstantyn_diachenko ,

Thank you very much! I overlooked this option and will definitely give it a try.

I will keep you posted as soon as I would be allowed to test it in the CS environment.

Update: Unfortunately, it worked as expected and actually redirected my request to the external website.

I will try to check with Adobe if this is possible currently possible.

Regards,

Rustam

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U

user62746Author

Level 2

Hi,

Adobe has confirmed that this is not possible currently.

The originSelectors configuration in AEM as a Cloud Service lets us choose which origin to route to based on path/regex, but it doesn’t currently let us rewrite the path segment (for example, remove /posts) before forwarding to the external origin.

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konstantyn_diachenko

Community Advisor

@user62746 , Thank you for confirmation. I assumed it too.

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Kostiantyn Diachenko, Community Advisor, Certified Senior AEM Developer, creator of free AEM VLT Tool, maintainer of AEM Tools plugin.

MukeshYadav_

Community Advisor

Hi @user62746 ,
As per document, order of evaluation https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/implementing/content-delivery/cdn-configuring-traffic#order-of-evaluation
If requirement is similar to ProxyPass instead 301 browser redirect, it can be possible with two steps solution

The CDN evaluates Request Transformations (modifying the path) first, and then evaluates Origin Selectors .

By using a Variable, we can ensure that only the expected requests are affected (proxy), keeping the rest of AEM site safe.

kind: "CDN"
version: "1"
metadata:
  envTypes: ["dev", "stage", "prod"]
data:
  # STEP 1: Transform the path and "mark" the request
  requestTransformations:
    rules:
      - name: transform-external-path
        when:
          allOf:
            - reqProperty: tier
              equals: publish
            - reqProperty: path
              matches: "^/en-us/prefix/(.*)"
        actions:
          # This removes /prefix/ and keeps the rest of the URL via the backreference \1
          - type: transform
            reqProperty: path
            op: replace
            match: "^/en-us/prefix/(.*)"
            replacement: "/en-us/\1"
          # This sets a temporary internal flag (variable)
          - type: set
            var: "proxy_to_website"
            value: "true"

  # STEP 2: Route based on the "mark" set in Step 1
  originSelectors:
    rules:
      - name: route-to-external-origin
        when:
          var: "proxy_to_website"
          equals: "true"
        action:
          type: selectOrigin
          originName: external-website-origin

    origins:
      - name: external-website-origin
        domain: www.website.com