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How exactly does invalidate work (relative to deletion)?

Question asked by Rohini Behl on Apr 25, 2016
Latest reply on Apr 25, 2016 by Sandip Palamanda

The API reference states that there is a lighter load on origin because an If Modified Since (IMS) HTTP request is sent instead of a GET request. So is a conditional GET request being sent? Or a conditional HEAD request? What exactly allows for the lighter load on origin?