The HEAD request to check for an annotation includes these elements:
•If you’re accessing the namespace as an authenticated user, an Authorization header.
•The URL of the object.
•A type=custom-metadata URL query parameter.
•An annotation=annotation-name query parameter, where annotation-name is the name of the specific annotation for which you are checking the existence. If you’re checking for the default annotation, you can omit this query parameter.
To check whether an annotation exists for a specific object version, in addition to specifying the request elements listed above, specify this URL query parameter:
version=version-id
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