How can I configure a valid Pushbullet OAuth redirect URI for Dockerized n8n?

It sounds like n8n is still generating the callback URL based on its default internal URL, which uses localhost. When running behind a reverse proxy, you need to manually override the webhook URL that n8n uses so it correctly generates public URLs including the OAuth callback.

Solution: Set the WEBHOOK_URL Environment Variable

In your Docker container (or Docker Compose file), set the environment variable WEBHOOK_URL to your public URL. For example:

BASHCopied
export WEBHOOK_URL=https://n8n.mydomain.tld/

If you’re using Docker Compose, your n8n service might look like this:

YAMLCopied
services:
  n8n:
    image: docker.n8n.io/n8nio/n8n
    environment:
      - WEBHOOK_URL=https://n8n.mydomain.tld/
      - N8N_HOST=n8n.mydomain.tld
      - N8N_PORT=5678
      - N8N_PROTOCOL=https
    ports:
      - "5678:5678"

After making this change, restart your container so that n8n starts generating webhook URLs (including the OAuth callback) using your public URL. This should allow Pushbullet’s OAuth flow to use the correct callback (https://n8n.mydomain.tld/rest/oauth2-credential/callback) without error.

Additional Tip:
Ensure that the callback URL you register in the Pushbullet OAuth client exactly matches the URL generated by n8n (including the trailing slash if needed) to avoid mismatches.

Following these steps should resolve the “invalid redirect_uri” error you’re encountering.