n8n - 💡(How to fix) Fix Webhook returning 404 error: Cannot GET /webhook/single-webhook [2 comments, 2 participants]

I’m currently facing an issue while triggering an n8n webhook. The request is returning a 404 error with the following message:

TL;DR

The 404 error when triggering an n8n webhook may be due to the incorrect HTTP method or an unregistered webhook, and switching to the correct method or registering the webhook could resolve the issue.

Guidance

• Verify that the webhook is correctly registered and the workflow is active in n8n, as the error message suggests the endpoint is not recognized.
• Check the n8n documentation to ensure the correct HTTP method is being used for the webhook; the provided message indicates a GET request, but the method specified is POST.
• Review the Azure App Service configuration to ensure it is correctly routing requests to the n8n instance.
• Test the webhook with a tool like Postman or cURL to isolate the issue and verify the request is being sent correctly.

Example

No code example is provided as the issue seems related to configuration or method usage rather than code implementation.

Notes

The solution may depend on the specific n8n version and Azure App Service configuration, which are not detailed in the issue. Additionally, ensuring the webhook URL and credentials are correct is crucial.

Recommendation

Apply workaround: Verify and correct the HTTP method and webhook registration, as these are the most likely causes of the 404 error, and directly address the symptoms described.