Patent ID: 6826626
Filing Date: 2004-11-30
Classification: G06F,Y10S

Abstract:
A method of retrieving data over a content distribution network, said method comprising:a step, performed by a client, of sending a request for data for a resource, a step, performed by a server responsively connected to said client, of receiving said request for data sent by said client; a step, performed by said server, of identifying a reference for an identity response to said request; a step, performed by said server, of comparing said reference with said identity response to said request for data to generate a delta encoded response based on differences between said identity response and said reference; a step, performed by said server, of sending said delta encoded response and an identification of said reference to said client; a step, performed by said client, of reconstituting said identity response using said delta encoded response and a locally stored copy of said reference if said client has previously stored a copy of said reference, otherwise retrieving a copy of said reference and then reconstituting said identity response using said delta encoded response and the retrieved copy of said reference; and a step, performed by said server, of tracking use of said reference and replacing said reference when more than a predetermined number of delta encoded responses generated using said reference fall more than a predetermined number of standard deviations from a mean of a distribution of delta encoded responses generated using said reference.