Patent ID: 8868834

Claim:
A computer-implemented method comprising: caching, responsive to a first request for specific content, the specific content and a first checksum, wherein caching the specific content produces a cached instance of the specific content representative of a form of the specific content at the time of caching, and wherein the first checksum identifies the cached instance of the specific content; receiving a second request for the specific content; submitting a request for a second checksum, the second checksum identifying a current instance of the specific content, and wherein the current instance is representative of a present form of the specific content; submitting a request for the current instance of the specific content; receiving the second checksum identifying the current instance of the specific content contemporaneous with transfer of the current instance of the specific content commencing; serving, responsive to the second request, the cached instance of the specific content without waiting for the transfer of the current instance to complete when the first checksum matches the second checksum; and serving, responsive to the second request, the current instance of the specific content upon completion of the transfer of the current instance when the first checksum does not match the second checksum.