Webhook for Deals

JCabataña — Fri, 20 Jun 2025 09:53:02 GMT

Hi, why am I getting this error message for Webhooks? I tested my endpoint using Postman and it worked — I was able to receive JSON data. However, when it comes to HubSpot Deal creation, I get the following error response. Any ideas on what might be causing this?

{
"success": {
"statusCode": 417
},
"fail": null
}

Re: Webhook for Deals

ArisudanTiwari — Fri, 20 Jun 2025 17:51:20 GMT

Hi @JCabataña ,

That "417 Expectation Failed" error you're seeing usually means HubSpot is sending a request with a header your server isn’t expecting, specifically the "Expect: 100-Continue" header.

So why does this happen?
When HubSpot sends a webhook, it may include the "Expect: 100-Continue" header. This is totally normal, but some servers or proxies don’t know how to handle it and just reject the request, which leads to the 417 error.

When you test the same endpoint in Postman, it works fine because Postman usually doesn’t send that header at all.

Here’s how you can fix it:

Update your server to either ignore or handle the "Except" header.
- In Node.js/Express, you can add middleware to bypass or process it.
- In .NET, you can turn off the expectation check.
If you're running behind a proxy or load balancer, make sure it’s not blocking or misinterpreting that header either.

A few other things to double-check:

Make sure your webhook URL is publicly accessible and secured with HTTPS.
The endpoint shouldn’t require any extra headers or authentication that HubSpot doesn’t send.
And just in case, make sure your HubSpot app or workflow has the right webhook permissions set up.

Here are a few links you can check-
https://developers.hubspot.com/docs/api/webhooks

https://community.hubspot.com/t5/APIs-Integrations/Deal-created-webhooks-not-firing/m-p/1098269/highlight/true?profile.language=fr

https://community.hubspot.com/t5/APIs-Integrations/Webhook-URL-fails-SubscriptionWebhookErrorCategory-CONNECTION/m-p/675158

https://stackoverflow.com/questions/566437/http-post-returns-error-417-expectation-failed

https://sitechecker.pro/what-is-417-status-code/

Re: Webhook for Deals

JCabataña — Mon, 23 Jun 2025 00:05:51 GMT

Thanks @ArisudanTiwari for the response, i will try

topic Re: Webhook for Deals in APIs & Integrations

Webhook for Deals

Re: Webhook for Deals

Re: Webhook for Deals