# Package org.apache.olingo.server.api.etag

Olingo Server API - ETag The etag package is used to condense all about the Olingo ETag handling.

See: Description

- Interface Summary
  Interface | Description
  --- | ---
  CustomETagSupport | Processors that would like to support etags for certain entity sets can implement this interface.
  ETagHelper | Used for ETag-related tasks.
  ServiceMetadataETagSupport | Register implementations for this interface in oder to support etags for the metadata document and service document.

- Enum Summary
  Enum | Description
  --- | ---
  PreconditionException.MessageKeys |

- Exception Summary
  Exception | Description
  --- | ---
  PreconditionException | This exception is thrown for invalid precondition error cases.

## Package org.apache.olingo.server.api.etag Description

Olingo Server API - ETag

The etag package is used to condense all about the Olingo ETag handling.

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