# upstream_unavailable

> A service bymundi depends on did not answer.

**Dependency unavailable** · HTTP 503

## What it means

A service bymundi depends on did not answer.

## What to do

Retry after a short wait, with the same Idempotency-Key for writes.

## Example

```json
{
  "type": "https://api.bymundi.com/problems/upstream_unavailable",
  "title": "Dependency unavailable",
  "status": 503,
  "detail": "A service bymundi depends on did not answer.",
  "code": "upstream_unavailable",
  "requestId": "req_…"
}
```

How to read any error: [Errors guide](https://api.bymundi.com/docs/guides/errors.md).