Patent ID: 9635095
Date: 2017-04-25
CPC Classifications: H04L

Claim:
1. A method of operating a content delivery system to handle purge instructions, the content delivery system comprising a plurality of content delivery nodes that cache content between at least one origin server and end user devices, the method comprising: in a first content delivery node, receiving a purge instruction, from a purge issuing device, to purge first content stored in the first content delivery node and responsively purging the first content; responsive to purging the first content, in the first content delivery node, transferring a content request for delivery to a second content delivery node, wherein the content request comprises a request for second content to replace the first content and a revision indicator of the first content; in the second content delivery node, receiving the content request; in the second content delivery node, when the revision indicator of the first content indicates an earlier revision than third content stored in the second content delivery node, then transferring the third content as the second content for delivery to the first content delivery node; in the second content delivery node, when the revision indicator of the first content indicates a same revision or a later revision as the third content stored in the second content delivery node, then requesting and receiving fourth content from a data, node and transferring the fourth content as the second content for delivery to the first content delivery node; and in the first content delivery node, receiving the second content for storage in the first content delivery node.