ServiceUnavailable.yaml

description: |
  Where status code 503 (Service Unavailable) is returned then an [NHSDigital-OperationOutcome](https://fhir.nhs.uk/StructureDefinition/NHSDigital-OperationOutcome) will be included in the body, as detailed below.
  In response to receiving this status code, it is recommended that clients retry at a later time based on a returned `Retry-After` header when provided.

  | issue.details.coding.code | issue.code | Coding System                                                      | Description                                                                                                                          |
  | ------------------------- | ---------- | ------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------ |
  | REC_UNAVAILABLE           | transient  | [BaRS Error Code](https://fhir.nhs.uk/CodeSystem/http-error-codes) | A request to an internal component timed out whilst attempting to serve a response or the system is currently otherwise unavailable. |

headers:
  X-Correlation-ID:
    $ref: '../headers/response/CorrelationID.yaml'
  X-Request-ID:
    $ref: '../headers/response/RequestID.yaml'
  Content-Type:
    $ref: '../headers/response/ContentTypeFhirJson.yaml'
  Retry-After:
    $ref: '../headers/response/RetryAfter.yaml'
content:
  application/fhir+json:
    schema:
      $ref: '../NHSDigital-OperationOutcome.yaml'
    example:
      $ref: '../../examples/NHSDigital-OperationOutcome-503.json'