URL_TARGET_NOT_ALLOWED

When it happens

The webhook URL points to an internal network address: a private, loopback or link-local IP, or a host name that resolves to one. If any of the addresses a host resolves to is internal, the URL is rejected. A host name that does not resolve yet is accepted.

How to fix it

Use a public endpoint reachable from the internet. For local development, expose your server through a public tunnel.

Retry

Not as is: the same request fails the same way. Fix the cause described above, then send the request again, under a new Idempotency-Key if the body changed.

Returned by

The operations where this code is most likely. The list is not exhaustive.

• POST /v1/accounts/{account_id}/webhooks
• PATCH /v1/accounts/{account_id}/webhooks/{webhook_id}

Example response

When this error occurs, the API answers 422 Unprocessable Content with a JSON body of this shape:

{
  "type": "https://docs.beel.es/errors/URL_TARGET_NOT_ALLOWED",
  "title": "URL_TARGET_NOT_ALLOWED",
  "detail": "The webhook URL points to an internal network address. Use an endpoint reachable from the internet.",
  "instance": "/v1/<resource>",
  "errors": [],
  "success": false,
  "error": {
    "code": "URL_TARGET_NOT_ALLOWED",
    "message": "The webhook URL points to an internal network address. Use an endpoint reachable from the internet.",
    "details": {}
  },
  "meta": {
    "timestamp": "2026-05-21T10:00:00Z",
    "request_id": "4bf92f3577b34da6a3ce929d0e0e4736"
  }
}

The type URI is stable and always resolves to this page.

Message

Send the request with Accept-Language: <es|en|ca> to receive the message in your preferred language.

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