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"Expires:" Header should be set to the request date #71
Currently we set the expires header to '-1' which, according to RFC 2616 is a possible way to mark content as stale;
This works for most clients, however Spring Rest Support seems to have a problem with this. So we should probably switch to the recommendation to set the Expire-Header to the Date of the request (or, if this value is not easily available at the place where the response is generated, at least to "0").