How to Run n8n in a Cloud Sandbox With a Working Webhook URL

sbx new --name n8n-demo --type small
id=sb_68ufa2y5te                                   # from sbx new
N8N_URL=silent-stormy-mint-5678.box.sandboxer.com  # <subdomain>-5678.box.sandboxer.com

sbx exec $id "docker volume create n8n_data"
sbx exec $id --timeout 590 "docker pull docker.n8n.io/n8nio/n8n"
sbx exec $id "docker run -d --name n8n --restart unless-stopped \
  -p 5678:5678 \
  -e GENERIC_TIMEZONE=UTC -e TZ=UTC \
  -e N8N_ENFORCE_SETTINGS_FILE_PERMISSIONS=true \
  -e N8N_HOST=$N8N_URL -e N8N_PROTOCOL=https \
  -e N8N_WEBHOOK_URL=https://$N8N_URL/ \
  -e N8N_PROXY_HOPS=1 \
  -v n8n_data:/home/node/.n8n \
  docker.n8n.io/n8nio/n8n"
sbx exec $id "docker logs n8n 2>&1 | grep -A1 'Editor is now'"

Editor is now accessible via:
https://silent-stormy-mint-5678.box.sandboxer.com

There are deprecations related to your n8n setup. Please take the recommended actions to update your configuration:
 - WEBHOOK_URL -> Use N8N_WEBHOOK_URL instead, which sets the base URL for both test and production webhooks.

sbx host $id 5678 --title n8n

B=https://silent-stormy-mint-5678.box.sandboxer.com
curl -s -o /dev/null -w "%{http_code}\n" $B/
# 401
curl -s -D - -o /dev/null -c jar.txt "$B/?_token=<token>" | grep -iE "^HTTP|^location"
# HTTP/2 302
# location: /
curl -s -b jar.txt $B/ | grep -o "<title>[^<]*</title>"
# <title>n8n.io - Workflow Automation</title>
curl -s -b jar.txt $B/healthz
# {"status":"ok"}

[
  {
    "id": "helloWebhook01",
    "name": "Hello webhook",
    "active": false,
    "nodes": [
      {
        "id": "9f1c2a3b-0000-4000-8000-000000000001",
        "name": "Webhook",
        "type": "n8n-nodes-base.webhook",
        "typeVersion": 2,
        "position": [0, 0],
        "webhookId": "9f1c2a3b-0000-4000-8000-0000000000aa",
        "parameters": { "httpMethod": "POST", "path": "hello", "responseMode": "lastNode", "options": {} }
      },
      {
        "id": "9f1c2a3b-0000-4000-8000-000000000002",
        "name": "Reply",
        "type": "n8n-nodes-base.set",
        "typeVersion": 3.4,
        "position": [220, 0],
        "parameters": {
          "assignments": { "assignments": [
            { "id": "a1", "name": "greeting", "type": "string", "value": "={{ 'hello ' + $json.body.name }}" },
            { "id": "a2", "name": "receivedAt", "type": "string", "value": "={{ $now.toISO() }}" }
          ] },
          "options": {}
        }
      }
    ],
    "connections": { "Webhook": { "main": [[{ "node": "Reply", "type": "main", "index": 0 }]] } },
    "settings": {}
  }
]

sbx scp hello-webhook.json $id:/home/user/hello-webhook.json
sbx exec $id "docker cp hello-webhook.json n8n:/tmp/hello-webhook.json"
sbx exec $id "docker exec n8n n8n import:workflow --input=/tmp/hello-webhook.json"
sbx exec $id "docker exec n8n n8n publish:workflow --id=helloWebhook01"
sbx exec $id "docker restart n8n"

Importing 1 workflows...
Successfully imported 1 workflow.
Publishing workflow with ID: helloWebhook01 (current version)
Note: Changes will not take effect if n8n is running.
…
Finished building workflow dependency index. Processed 0 draft workflows, 1 published workflows.