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Patent

Protocol for distributing fresh content among networked cache servers

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TLDR
In this article, the authors propose a technique for automatic, transparent, distributed, scalable and robust replication of document copies in a computer network where request messages for a particular document follow paths from the clients to a home server that form a routing graph.
Abstract: 
A technique for automatic, transparent, distributed, scalable and robust replication of document copies in a computer network wherein request messages for a particular document follow paths from the clients to a home server that form a routing graph. Client request messages are routed up the graph towards the home server as would normally occur in the absence of caching. However, cache servers are located along the route, and may intercept requests if they can be serviced. In order to be able to service requests in this manner without departing from standard network protocols, the cache server needs to be able to insert a packet filter into the router associated with it, and needs also to proxy for the home server from the perspective of the client. Cache servers cooperate to update cache content by communicating with neighboring caches whenever information is received about invalid cache copies.

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Citations
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References
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Patent

Interactive computer network and method of operation

TL;DR: In this paper, a distributed processing, interactive computer network and method of operation is described, which is designed to provide very large numbers of simultaneous users access to large number of applications which feature interactive text/graphic sessions.
Patent

A method and system for distributed caching, prefetching and replication

TL;DR: In this paper, a technique for automatic, transparent, distributed, scalable and robust caching, prefetching, and replication in a computer network that request messages for a particular document follow paths from the clients to a home server that form a routing graph.
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A system and method for using cached data at a local node after re-opening a file at a remote node in a distributed networking environment

TL;DR: In this paper, the client cache data blocks are tested for validity in the client processing system by using modification times as measured by the server processing system, and if the cache data block are determined to be valid, the data blocks were discarded, and the file is accessed from the server system.
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Locating resources in computer networks having cache server nodes

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Inter-cache protocol for improved web performance

TL;DR: In this paper, information about the contents of the neighbor caches is exchanged between these caches so that when a request for an object is received, the object can be retrieved from the cache in which it is stored.
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