1. A machine-implemented method comprising: receiving a request from a client, the request including a first entity tag that includes a first starting identifier and a first ending identifier, the first starting identifier associated with a starting entry and the first ending identifier associated with an ending entry; selecting a second entity tag that corresponds to one or more update entries; determining whether the second entity tag includes a second starting identifier that matches the first ending identifier included in the first entity tag; and in response to determining that the second entity tag includes the second starting identifier that matches the first ending identifier, sending the second entity tag and one or more of the update entries to the client.