The Varnish configs do not strip Klaviyo marketing parameter

[Gelmo]

Preconditions (*)

1. Any Magento version that includes a suggested Varnish VCL config.
2. Using Varnish along with a VCL that is included with Magento.
3. Usage of Klaviyo's marketing email services/modules.

Steps to reproduce (*)

1. Use a VCL that is included with Magento.
2. Send a marketing email via Klaviyo.
3. Watch varnishlog.
4. Visit the site using a link that is included in a Klaviyo-generated email.
5. Visit the site using a similar link that does not include the _kx query parameter.
6. Compare the results shown by varnishlog.

Expected result (*)

1. The _kx parameter should be stripped, ensuring that visitors using links with the _kx parameter are served the cached version of the requested page.

Actual result (*)

1. Varnish does not strip the parameter, and since the value is unique per visitor, those requests will not match any hashes in Varnish's cache.
2. This also results in additional PHP load due to the request needing to be processed by Magento.

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Please provide Severity assessment for the Issue as Reporter. This information will help during Confirmation and Issue triage processes.

• [ ] Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• [ ] Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• [X] Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• [ ] Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• [ ] Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

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[Gelmo]

@magento I am working on this

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[Gelmo]

@magento add to contributors team

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[Gelmo]

@magento I am working on this

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[engcom-Dash]

Hi @Gelmo ,

We are trying to reproduce the issue in 2.4-develop instance but we are not able to reproduce. Steps We followed: 1.Install mAgento 2.Done Varnish Setup Configuration 3.Install Klaviyos Module 4.Integrate with magento from klaviyos 5.we are not able to integrate the module

Screenshots:

Still we are working in this module to reproduce the issue...we will reproduce the issue ASAP.

Let us know if we missing anything!!! Thanks!!!

[vasileuskidzmitry]

@engcom-Dash Hello! How to move this issue from the ground? Can it be assigned to me to complete the rest of the required steps?

[vasileuskidzmitry]

@magento I'm working on this

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Hi @vasileuskidzmitry! :wave: Thank you for collaboration. Only members of Community Contributors Team are allowed to be assigned to the issue. Please use @magento add to contributors team command to join Contributors team.

[vasileuskidzmitry]

@magento add to contributors team

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Hi @vasileuskidzmitry! :wave: Thank you for joining. Please accept team invitation :point_right: here :point_left: and add your comment one more time.

[vasileuskidzmitry]

@magento I'm working on this

[vasileuskidzmitry]

I'm unable to edit the original comments to update steps so I will add them here.

Steps to reproduce (*)

1. Use a VCL that is included with Magento.
2. Read this article as confirmation that _kx parameter belongs to Klaviyo marketing campaigns - https://help.klaviyo.com/hc/en-us/articles/115005076767.
3. Switch Magento/Adobe Commerce to developer mode so the X-Magento-Cache-Debug header is included in the response.
4. Visit any page (for instance the Home one) twice. Check that X-Magento-Cache-Debug contains HIT value to confirm that the page is cached by Varnish.
5. Now add _kx parameter with some random unique value (Ex. https://yourdomain/?_kx=1) to the URL and visit it.

Expected Result

1. When you visit the URL form point 5, you see HIT value in the X-Magento-Cache-Debug, because _kx is a marketing parameter that should be omitted.
2. Every time you change _kx to some new value, you see HIT anyway.

Actual Result

1. You see MISS in that header.
2. Every time you change _kx to some new value, you see MISS anyway. A new cache entity is created in Varnish on every such request.

[vasileuskidzmitry]

cc @engcom-Dash

[vasileuskidzmitry]

Added new PR

[vasileuskidzmitry]

cc @engcom-Bravo

[ihor-sviziev]

I updated priority to p2, to make it similar to https://github.com/magento/magento2/pull/38302#event-11314093429

[vasileuskidzmitry]

@ihor-sviziev Here is one another marketing system https://www.northbeam.io/ that uses its own marketing parameters (starting with "nb_"). Should I create a separate issue/PR for this or it could be done here or in #38302 ?

[ihor-sviziev]

@vasileuskidzmitry I don't mind about any of these options.