Research On Caching Technology Of Web Proxy Server

Currently, With the rapid development momentum of network tech-nology, the network traffic has been being very expanded.Howerver, the result of the increase in the number of Internet users is that the access to the Web server also significantly increases. If within a network area or a fixed period, the same data over and over again from the Web server is responsed to the user, which will bring great pressure to the Web server, and occupied limited network bandwidth of network operators at the same time.Fortunately, Web caching and prefetching can greatly improve the performance of network bandwidth,solve the network congestion and reduce user access latency time.The paper describes the principle and working mechanism of Web proxy server, on this basis, study the basic concepts of Web caching and prefetching and key technology, caching system and classification of prefetching algorithm and working mechanism. Considering the user access to Web objects intervals,this article improved cache replacement algorithm based on GDS algorithm and verified the performance of the algorithms through the experimental.The cache replacement algorithm is the core of Web proxy cache replacement strategy, the cache strategy can effectively improve the performance of the proxy server. This paper considered the sizes, number of visits, access time and last accessed time and other factors of the object Web caching, studied the traditional Web cache replacement algorithm, and analyzed the performance of the common replacement algorithm, such as LRU, LFU, SIZE, GDS. Based on systematic analysis of GDS and GDSF algorithm, this paper proposed GDSF-T algorithm, in addition to taking document object size into account, also taking the number of visits and the cache object relationship survival time into account. Squid proxy server verifies the performance of the improved algorithm, compared with LRU, GDSF algorithm, and the results show that the improved algorithm GDSF-T in the request hit rate and byte hit rate has a good upgrade.Considering GDSF-T caching algorithm, this paper designed the Web proxy service cache system together with the general prefetching technique. The experimental results prove that the new system is able to between2%and4%higher than that of traditional proxy cache server about user request shooting, and proved that the proxy cache system with Web prefetching technology has better performance than individual caching technology.