Can't pass the json payload

[Kundan547]

When creating a Sensor with an HTTP trigger, it is not possible to forward the incoming JSON payload directly to the downstream endpoint.

The payload section requires a dest field, but leaving it empty produces an error:

template http-trigger is invalid, payload index: 0. err: parameter destination can't be empty

This prevents sending the dependency event payload unchanged to an HTTP endpoint.

To Reproduce

Steps to reproduce the behavior:

Create an EventSource that emits a JSON payload.

Create a Sensor with an HTTP trigger, using payload with src.dataKey: body and leaving dest empty.

Apply the Sensor.

See error during validation.

Example Sensor snippet:

triggers:

• template:
  name: http-trigger
  http:
  url: http://my-app.my-ns.svc.cluster.local:8080/v1/my-endpoint
  method: POST
  headers:
  Content-Type: application/json
  payload:
  - src:
  dependencyName: dt-mv-prediction-orchestrator-dep
  dataKey: body
  dest: "" # ❌ not allowed

Error:

template http-trigger is invalid, payload index: 0. err: parameter destination can't be empty

Expected behavior

The Sensor should allow forwarding the dependency event’s JSON payload without modification — i.e., support an option where the full body is passed directly to the HTTP request body, without requiring a dest mapping.

Environment

Kubernetes version: v1.32.2

Argo Events version: v3.6.10

Argo Workflows version: v3.6.10 (if relevant)

Additional context

The current workaround is to explicitly use dest: body, which wraps the payload correctly, but this is unintuitive and prevents forwarding the payload as-is.