Workflow Succeeds (200 OK), but Browser Fails to Render 'Respond to Webhook' Page

[Masaho_Ike]

Hi community,

I’m facing a very strange issue with a two-part webhook workflow on n8n Cloud. I’d be grateful for any ideas.

My Goal:
I have a workflow to create Salesforce records from a PDF, with a manual duplicate check step for the user.

The Architecture:

1. Workflow A: A web form POSTs a file. The workflow uses AI to extract data and searches Salesforce for duplicates.
2. If a potential duplicate is found, Workflow A responds with an HTML “Confirmation Page”.
3. This page has a form with two buttons (“Log as Duplicate” / “Create New Record”). The form POSTs the user’s decision to a second webhook, which triggers Workflow B.
4. Workflow B: Receives the user’s decision, performs the final action in Salesforce, and should respond with a final “Success” or “Logged” page.

The Problem:
When a user clicks a button on the “Confirmation Page”, the POST request to Workflow B is sent.

• In the n8n Executions log, Workflow B completes successfully.
• In the browser’s Network DevTools, the request to Workflow B’s webhook shows a 200 OK status.
• However, the browser itself does not render the response. It shows a blank white page or a generic browser error like “Connection Refused”.

What I’ve Ruled Out:

• Workflow Error: The n8n execution log is green (successful).
• Browser Cache: The issue persists even after a hard refresh (Ctrl+Shift+R).
• HTML Content Error: The issue still happens even if the final Respond to Webhook node sends a minimal HTML page like <h1>OK</h1>.
• favicon.ico Error: The request for favicon.ico also returns a 200 OK.
• Testing Environment: I am using the Production URL in a separate, normal browser tab (not the n8n editor preview).

My Question:
Has anyone encountered this behavior where a successful 200 OK from a Respond to Webhook node fails to render in the browser? Could this be a specific security policy from n8n Cloud, or am I missing something else?

Details:

• n8n Version: 1.108.1 (Cloud)
• Database: Default
• Running n8n via: n8n Cloud

Thank you for your help!

[barn4k]

hello @Masaho_Ike

Please, share the workflow.

You can select all nodes with Ctrl+A and copy them with Ctrl+C. Then, past the content after pressing the button </> with Ctrl+V.