Patent ID: 8626866

Claim:
A network caching system, comprising: a caching computer having a processor and configured to receive a data access request from a client for data, the caching computer coupled to an origin computer; the caching computer further configured to send a fetch on demand (FOD) request to the origin computer to obtain attributes associated with the data; the caching computer further configured to receive the attributes associated with the data and determine whether attributes associated with the data at the caching computer differ from the attributes received from the origin computer; the caching computer to service the data access request in response to the caching computer determining that the attributes at the caching computer do not differ from the attributes received from the origin computer; and the caching computer to acquire the data and the attributes associated with the data from the origin computer in response to the caching computer determining that the attributes at the caching computer differ from the attributes received from the origin computer.