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| Parameter | Description | Available at, method | Values | By default | Example |
|---|---|---|---|---|---|
| if-modified-since | Return header Returns "HTTP 304 Not Modified if data has not been updated since requested date | list | Date in specify formatD, d M Y H:i:s GMT | null | if-modified-since: Fri, 18 Sep 2015 10:34:37 GMT |
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