AJAX call to Klaviyo API being blocked by browser's tracker-prevention

Question

We have a newsletter signup form on our website that uses Javascript AJAX to make an API call to https://a.klaviyo.com/client/subscriptions/ to add someone to our newsletter list in Klaviyo.  We have noticed that sometimes if the user’s browser is configured to block trackers, it blocks this API request.  I found some other forum posts (e.g. this one) describing this happening when it actually is trackers (klclick1.com), but in our case it isn’t click-tracking at all, it’s just trying to send a request to the API.  Is there anything we can do to prevent API calls from being classified as trackers (without requiring users to change their browser settings)?

Kim from Cadence · Accepted Answer

​@a22, client-side tracking for Klaviyo — and other analytics tools—can be unreliable.It sounds like you’ve created a custom form you’ve wired up to call Klaviyo’s client APIAPI vs. using a Klaviyo native signup form (built in the Klaviyo UI), so this advice is for the former case.Thebestworkaround wouldbe to call an API endpoint you control and proxythese requests through to Klaviyo’s server-side subscription APIs. I’d avoid proxying to the client-side subscription APIs; these are intended to be called from a browser…there be dragons trying to simulate that with a proxy API.Hope this helps!Cadence/Book a demo

Byrne C · Answer

Hi ​@a22,+1 to the server-side endpoint recommendation! Additionally, you might be able to reverse-proxy the call through your own domain. So instead of showinghttps://a.klaviyo.com/client/subscriptions, you’d showhttps://api.yourdomain.com/klaviyo-subscribeor something similar, so any tracker prevention service sees that the call is still coming from you.

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