How can I send parallel, distinct responses from a single webhook trigger in n8n?

Below is a detailed answer to your questions:

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1. Is it technically possible to send multiple webhook responses from a single trigger?

No. n8n’s Webhook node (like most HTTP servers) accepts one incoming request and sends one HTTP response. Although you can branch your workflow into parallel processing paths, they must ultimately combine into a single response output. There isn’t native support for sending two separately delivered HTTP responses from one webhook trigger.

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2. What is the recommended approach to configure this in n8n’s webhook settings?

The recommended approach is to aggregate the data from your parallel branches into a single response. You can do this with one of the following strategies:

• Aggregate in a single JSON object:
  Use your parallel branches to separately process the dialog content and header information. Then merge the results into one JSON response (for example, with keys such as "dialogContent" and "headerInfo").

• Use the Respond to Webhook node:
  This node gives you fine control over the response data. You can structure the final output to reflect both the main dialogue and secondary header information. For example, after processing both branches, you can use a “Set” or “Merge” node to combine the results before sending them back using the Respond to Webhook node with the desired keys.

Sample aggregated response structure:

JSONCopied
{
  "dialogContent": {
    "message": "This is the main dialog response",
    "otherInfo": "..."
  },
  "headerInfo": {
    "stageName": "Stage 1",
    "title": "Header Title"
  }
}

This way, even though only a single HTTP response is sent, your workflow conveys both pieces of information.

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3. How should the UI server be structured to distinguish between the two responses?

Since the single response payload will include both the dialog and header information, your UI server should:

• Parse the JSON response:
  Once the webhook call returns, the UI server (or client code handling the webhook response) should parse the JSON to extract the distinct keys.

• Route data appropriately:
  For example, assign data from the "dialogContent" key to the dialog box, while assigning data from "headerInfo" to the top banner. The separation is performed in your front-end logic or by your API, based on the key names.

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Summary

• Multiple responses? Not directly; you must bundle all outputs into a single HTTP response.
• n8n configuration: Use parallel branches to process different aspects of your data and then merge them (using nodes like Merge, Set, or Respond to Webhook) into a single structured JSON response.
• UI server changes: Ensure the UI server parses the JSON and routes "dialogContent" and "headerInfo" to the correct areas in the UI.

This setup allows you to trigger one comprehensive response from your webhook that carries all the information the UI requires for both dialog display and top banner information.