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I remember there being some kind of 'etag' that can be provided with a read to make sure the data is OK. Would it be possible for the proxy to know what the tag is for an object and check it when doing the read from the object server? It could then try other replicas if the tag was wrong before bailing with an error. That would seem to give the attributes of your X-Newest suggestion but usually not have the overhead of checking multiple copies.