The HEAD request to check the existence of a directory has these elements:
•If you’re accessing the namespace as an authenticated user, an Authorization header
•The URL of the directory
By default, you can't check the existence of a directory if it has been deleted. If the namespace supports versioning, you can check for deleted objects and directories. To do this, specify this URL query parameter:
deleted=true
You can also specify deleted=false, which results in the default behavior.
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