n8n Template environment variable WEBHOOK_URL not passed into container

Resolved

Nnavy110917FREE4/5/2026

Hi, I deployed n8n using Zeabur Template. All nodes show "Invalid URL" error when executed.

The root cause is that n8n cannot read the WEBHOOK_URL environment variable inside the container.

I have configured the following environment variables:

WEBHOOK_URL = https://kevinlin.zeabur.app/
PUBLIC_DOMAIN = kevinlin.zeabur.app
N8N_EDITOR_BASE_URL = https://kevinlin.zeabur.app/

After saving and redeploying multiple times, the problem still persists. The error stack trace shows "TypeError: Invalid URL at appendResumeToken" which confirms WEBHOOK_URL is empty inside the container.

Could you please advise how to make the environment variables correctly pass into the n8n container?

Thank you.

1 Reply

BCBohan ChenEMPLOYEE4/8/2026

Hi Kevin,

Found and fixed it. The root cause wasn't WEBHOOK_URL — that one was being passed in correctly. The actual issue was your N8N_PROTOCOL variable, which had a leading space in its value (" https" instead of "https"). n8n internally builds webhook URLs from N8N_PROTOCOL + N8N_HOST, so every URL it generated started with a space character, which is what triggered the TypeError: Invalid URL at appendResumeToken you were seeing.

We've trimmed the leading space and your n8n pod has been redeployed. We verified that:

N8N_PROTOCOL=https is now correctly set inside the container
n8n started cleanly (v2.15.0) and your "My workflow" was activated on startup
The editor URL https://kevinlin.zeabur.app is reachable (HTTP 200)

Your webhooks should work normally now. If you still see "Invalid URL" anywhere, please reply with the new error message and we'll keep digging.

A small unrelated note from the startup logs: n8n is also warning that N8N_RUNNERS_ENABLED is deprecated and can be removed from your variables — you can safely delete it whenever you next edit your config.

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