Workflow Human Input human_input_required event returns empty data in Open API streaming call

[ljs20182018]

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Dify version

1.14.0-rc1

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

1. Create a new Workflow application on Dify console.
2. Add a Human Input node into workflow canvas, configure custom form content, approve/reject action buttons, set delivery method to Web App.
3. Complete workflow configuration and publish the application.
4. Test in Dify web frontend preview chat page: the human_input_required event returns complete data payload, including form_content, form_token, actions and all form metadata.
5. Call official Open API endpoint /v1/chat-messages with parameter response_mode=streaming.
6. Check the returned SSE streaming response: the human_input_required event only contains event name, with completely empty data body.

✔️ Expected Behavior

When calling via Open API streaming mode, the returned human_input_required event should be completely consistent with the web frontend preview result.
It should return full payload data, including form_content, form_token, action button configurations and all original form information, so that external systems can obtain approval information and resume the suspended workflow.

❌ Actual Behavior

When calling Dify Workflow via official Open API streaming interface /v1/chat-messages, the triggered human_input_required event has empty data field.
All metadata of Human Input node is missing, including form content, form token, button options. There is no valid information for external approval integration and workflow recovery.

API returned raw data:

{"event":"human_input_required"}

[dosubot]

Hi @ljs20182018! I'm Dosu and I’m helping the dify team.

This matches a bug that was fixed after v1.14.0-rc1. PR #33580 (merged March 25, 2026) specifically addresses the empty human_input_required event payload in Service API streaming responses [1]. The fix adds proper form token loading via a load_form_tokens_by_form_id() helper to ensure form_token, form_content, actions, and other metadata are populated in the event payload [2].

To resolve this: Upgrade to a Dify version newer than March 25, 2026 (any release after the 1.14.0-rc1 that includes PR #33580).

For additional context, Issue #32831 tracks broader Service API HITL support gaps, and PR #32826 [3] adds dedicated Service API endpoints for Human-in-the-Loop workflows — worth following if you need full HITL API coverage.

To reply, just mention @dosu.

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