You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: A survey of web caching schemes for the Internet 
Chapter Title:  Cache coherency 
1. Abstract of Cited Paper (BIB001):  The bandwidth demands of the World Wide Web continue to grow at a hyper-exponential rate. Given this rocketing growth, caching of web objects as a means to reduce network bandwidth consumption is likely to be a necessity in the very near future. Unfortunately, many Web caches do not satisfactorily maintain cache consistency. This paper presents a survey of contemporary cache consistency mechanisms in use on the Internet today and examines recent research in Web cache consistency. Using trace-driven simulation, we show that a weak cache consistency protocol (the one used in the Alex ftp cache) reduces network bandwidth consumption and server load more than either time-to-live fields or an invalidation protocol and can be tuned to return stale data less than 5% of the time.

Literature Review:
Caches provide lower access latency with a side effect: every cache sometimes provide users with stale pages -pages which are out of date with respect to their master copies on the Web servers where the pages originated BIB001 . Every Web cache must update pages in its cache so that it can give users pages which are as fresh as possible. Caching and the problem of cache coherency on the World Wide Web are similar to the problems of caching in distributed file systems. However, the Web is different than a distributed file system in its access patterns, its larger scale, and its single point of updates for Web objects BIB002 .