Checks validity based on the given ETag and/org date.
Condition based on ETag.
Condition based on last modified date.
Valid if matching any of the given ETags.
Checks validity based on the given metadata.
Metadata of the representation.
Valid if modified since the given date.
Valid if not matching any of the given ETags.
Valid if not modified since the given date.
The conditions of an HTTP conditional request.