Webhook: Invalid URL (But works in Postman)

Forum|Forum|6 months ago
February 6, 2026
3 replies
142 views

Hey peeps!

I'm working with multiple 8-9 figure brands and I've set up custom events to get triggered from inside some of their flows.

Since ~19:30 GMT+2 February 5th, the webhooks are failing with 'invalid URL’ as a reason for failing.

But when I try and trigger the same exact API call with the same exact properties and inputs through Postman instead of a webhook, the event triggers properly (and it appears on the profile's Klaviyo events too).

I'm wondering if there's an issue in the translation from Klaviyo's webhook to actual API call.

P.S. I also updated the revision to the latest (2026-01-15) and adapted the webhook's body, but it still failed to trigger with the same reason, though, again, it worked in Postman

Best answer by Byrne C

Hi all.

I can confirm that the error message that you were seeing was unexpected behavior, and our team has worked to fix it. As of now, the incident has been resolved, and webhooks should be able to be created successfully, and fire without errors. Let me know if I can address any additional concerns.

whereisjad

Expert Problem Solver IV

@tsalamazing how are you specifying the webhook inside of Klaviyo? are you including any variables within the path?

— Jad A | Klaviyo + Shopify + API Integrations Specialist • 7+ Years' Experience Helping with new setups, seamless integrations, and API connections—happy to connect. http://ja-technical-consulting.xyz/

tsalamazingAuthor

Problem Solver I

@tsalamazing how are you specifying the webhook inside of Klaviyo? are you including any variables within the path?

Just the email as {{ person.email }}.

I spoke with support, seems there's an active bug

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Byrne CAnswer

Community Manager

Hi all.

I can confirm that the error message that you were seeing was unexpected behavior, and our team has worked to fix it. As of now, the incident has been resolved, and webhooks should be able to be created successfully, and fire without errors. Let me know if I can address any additional concerns.

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