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Client cache time to live. Number of hours until expiration. Used to manage client and proxy server caching.
See [catalog::Expiration](../../../../../ir-api/material-cat/image-rendering-api-ref/c-ir-material-catalog/c-ir-material-data-reference/ for details.


Real number, -2, -1, 0, or greater. Number of hours until expiration since the response image was generated. Set to 0 to always expire the response image immediately, which effectively disables client caching. Set to -1 to mark as never expire ; in this case the server always returns 403 status in response to conditional GET requests without checking whether the file has actually changed. Set to -2 to use the default provided by attribute::Expiration .


attribute::Expiration is used if the field is not present, if the value is -2, or if the field is empty.