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Some resources do not change very often and considerable performance improvements can be expected if the data can be read from the client cache instead of the backend system.

SAP Gateway supports the HTTP header field if-modified-since. This field is a time stamp and it can be read and compared with the last modification of the application data. If the last modification is older than if-modified-since then no application data needs to be read, and instead only an HTTP 304 response is returned – ‘not modified’.

You can find details about last modified and cache control under: