Origin Header Mismatch in GitHub Codespaces (Docker-in-Docker) with up to now n8n latest version (1.104.2)

Questions
1

Describe the problem/error/question

I’m trying to run a containerized version of n8n (preferably the latest version or 1.104.2) inside GitHub Codespaces using Docker-in-Docker, and I’d like the setup to be reproducible across Codespaces and local development (Windows 10/11 + Docker Desktop).

I resolved volume permission issues (e.g., via sudo chown) and can successfully run n8n. However, I’m now stuck with a major blocker:

When I try to open or create a workflow, the UI silently fails or crashes.

After digging into the logs, I see repeated errors like:

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Origin header does NOT match the expected origin. (Origin: "localhost:5678", Expected: "sturdy-barnacle-xxxx.app.github.dev")

I’m accessing n8n via the correct Codespaces public URL (https://sturdy-barnacle-xxxx.app.github.dev), so it seems like iframe-origin behavior inside Codespaces is sending localhost:5678 instead.

I would like to:

  • Keep the setup portable between Codespaces and my local Docker Desktop
  • Understand if this is a known limitation or if there’s a workaround (e.g., relaxing origin checks or handling proxying behavior better)

What is the error message (if any)?

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Origin header does NOT match the expected origin. (Origin: "localhost:5678", Expected: "sturdy-barnacle-xxxx.app.github.dev")

As a result, I cannot create or edit workflows.

Please share your workflow

N/A — I can’t get to the workflow editor because of the origin mismatch issue.

Share the output returned by the last node

N/A

Information on your n8n setup

  • n8n version: n8nio/n8n:latest (also tried with 1.104.2)
  • Database (default: SQLite): Neon PostgreSQ
  • n8n EXECUTIONS_PROCESS setting (default: own, main): default
  • Running n8n via (Docker, npm, n8n cloud, desktop app): Docker-in-Docker inside GitHub Codespaces (also running the same setup locally via Docker Desktop)
  • Operating system: GitHub Codespaces Linux container (based on Debian), host is Codespaces with Docker pre-installed

.env content:

ini

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N8N_ENCRYPTION_KEY=...
N8N_ENFORCE_SETTINGS_FILE_PERMISSIONS=true
N8N_RUNNERS_ENABLED=true
N8N_USER_MANAGEMENT_ALLOW_PASSWORD_RESET=true

docker-compose.yml:

yaml

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services:
  n8n:
    image: n8nio/n8n:latest
    ports:
      - "5678:5678"
    env_file:
      - .env
    volumes:
      - ./n8n_data:/home/node/.n8n
    restart: unless-stopped
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