Webhook Start Event Not Functioning in Camunda 8.3.x, SaaS

[ikheraj17]

Describe the Bug

A customer is having issues utilizing a Webhook start element to kick off a process instance; the webhook does not return the expected response in 8.3.x but works fine without modifying the process diagram in 8.2.x. I've attached a screenshot of the API calls made in Postman.

Please find the process diagram at hand here.

Steps to Reproduce

1. Download the BPMN file attached to this ticket and upload to Camunda 8 Web Modeler.

2. Deploy diagram to a 8.3.x Zeebe cluster.

3. Note that the 'Webhook' tab in the properties panel for the start element does not show an active webhook

4. Test the webhook and notice the absence of expected response

5. Repeat steps 2-4 with an 8.2.x. Zeebe cluster and note the response

Expected Behavior

The webhook should function properly in 8.3.x. and provide the expected response in Postman.

Hints

It seems that upon disabling the authentication and authorization tabs within the webhook element, the webhook functions in 8.3.x... Further testing needed.

Environment

• Camunda version: 8.3.0 SaaS

[chillleader]

Hi @ikheraj17, thank you for your report. This behavior is expected: in 8.3.0 the Webhook connector response doesn't have a body by default.

Instead, it is now possible to configure a custom response body. There's an example here (see 8. Response body expression).

[alexcorremans]

Hey @chillleader, since this looks like a breaking change for this customer, could this be added to the update guide and the announcements page?

Additionally, we just had another customer reach out about the empty response body (in SUPPORT-19277) because a response body was mentioned in an earlier blog post. Can something be added to the docs for this Connector to make it more clear an empty response is expected?

[chillleader]

Hey @alexcorremans I have created a task to fix this - the docs update has a high priority, we will tackle it soon.

I will close this issue once the docs are updated, @ikheraj17 please let us know if you have any issues with the new functionality.

[chillleader]

The docs update is merged and will be released soon.