# Service Unavailable

**HTTP Status:** 503 Service Unavailable
**RFC Reference:** [RFC 9110 Section 15.6.4](https://datatracker.ietf.org/doc/html/rfc9110#section-15.6.4)

A required downstream service is currently unavailable.

## Response


```http
HTTP/1.1 503 Service Unavailable
Content-Type: application/problem+json
Retry-After: 60

{
  "type": "https://docs.apiera.io/problems/service-unavailable",
  "title": "Service Unavailable",
  "status": 503,
  "detail": "A required downstream service is currently unavailable. Please try again later.",
  "instance": "/v1/products",
  "correlationId": "550e8400-e29b-41d4-a716-446655440000"
}
```

## How to Handle

1. Check the `Retry-After` header (60 seconds)
2. Wait before retrying
3. Implement exponential backoff for multiple failures


This is typically a temporary issue that resolves automatically.