Respond Immediately, Then Process Asynchronously to Prevent Timeouts

Many webhook senders (Stripe, GitHub, Shopify) expect a response within 5-30 seconds. If your n8n workflow takes longer, the sender times out and retries, causing duplicate processing. The fix: set the Webhook to respond via a Respond to Webhook node placed immediately after it, return 200 at once, then continue the heavy processing.

Why do webhook senders time out?

Many webhook senders (Stripe, GitHub, Shopify) expect a response within 5-30 seconds. If your workflow takes longer -- calling multiple APIs, processing files, running LLM calls -- the sender will time out and retry, creating duplicate processing. The fix: respond with 200 immediately, then continue processing.

Real-world example: A Shopify order webhook triggers inventory checks across 3 warehouses, shipping rate calculations, and a confirmation email. Total processing: 15-45 seconds. Shopify times out at 5 seconds.

How do you respond immediately and process later?

Place a Respond to Webhook node right after the Webhook node, then run the heavy work afterward:

Workflow structure:

[Webhook Node] --> [Respond to Webhook: 200] --> [HTTP Request: Warehouse 1]
  (Response Mode:                                        |
   "Using Respond                                   [HTTP Request: Warehouse 2]
   to Webhook Node")                                     |
                                                    [HTTP Request: Warehouse 3]
                                                         |
                                                    [Calculate Shipping]
                                                         |
                                                    [Send Confirmation Email]

Webhook node configuration:

{
  "httpMethod": "POST",
  "path": "shopify/orders",
  "responseMode": "responseNode"
}

Respond to Webhook node (placed immediately after Webhook):

{
  "respondWith": "json",
  "responseCode": 200,
  "responseBody": "={{ { \"received\": true } }}"
}

The caller gets 200 OK in milliseconds. All the heavy processing runs after the response is sent. Shopify will not retry, and your workflow has unlimited time to complete.

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