Checks if a data handle exists

The ID of the layer that the blob belongs to.

The data handle identifies a specific blob so that you can get that blob's contents. The data handle can only contain alphanumeric, '-' and '.' characters, [0-9, a-z, A-Z, -, .]. The maximum length of this field is 600 characters.

Billing Tag is an optional free-form tag which is used for grouping billing records together. If supplied, it must be between 4 - 16 characters, contain only alpha/numeric ASCII characters [A-Za-z0-9]. Grouping billing records by billing tag will be available in future releases.

Entity tags uniquely representing the requested resources. Makes the request method conditional on a recipient cache or origin server either not having any current representation of the target resource, when the field-value is "*", or having a selected representation with an entity-tag that does not match any of those listed in the field-value. For more information, see RFC 7232, section 3.2: If-None-Match.