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From an ArcGIS Server (9.3.x or 10.x) instance, can anyone confirm if REST HTTP response headers are modified when the data within a layer is updated?

For example, if I query a layer at time x and get a 200 OK response and E-Tag y and I query the same dataset at a later date, I'll generally receive a 304 Not Modified response with the same E-Tag. However I'd expect the E-Tag to change and to receive a 200 OK status if the layer data changed, is this the case?

If this is not the case, is there a way to test if data has changed since a particular date without actually pulling the data down.

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