The Reverse Proxy Technology Research Based On Spatial Information Network Access Mode

With the growing demand for Application of Spatial Information, earth observation data access need faster speed, higher resolution and greater amount of information, and network access to spatial information put forward higher requirements. The new type of spatial information access patterns based on geo-information browser/space information server(G/S), learning the advantages of C/S and B/S mode ,become the leader of new generation of spatial information access mode because of its advanced technology and good architecture. It's a new way of thinking to solve the problems faced by spatial information access. As a result of the huge amount of data access,bandwidth congestion, network delay, as well as a series of security problems in spatial information access, reverse proxy technology based on the G/S mode can solve these problems better.In the paper, the author first studied the G/S mode, distributed cluster technology and G/S Distributed Clusters, then analyzed the reverse proxy and the G/S reverse proxy technology, including G/S server caching strategies, application-layer firewall, load balancing technology.Combined with the popular open-source reverse proxy software named Squid, the author raised a configuration using for reverse proxy of G/S mode, and made a concrete realization of it. Finally, the author built an experimental platform, and made a comparison of actual data and summary under reverse proxy service using Squid. It has an important significance to enhance the performance of G/S distributed cluster.The results of this paper are mainly embodied in three aspects:First, combination of G/S cluster technology and reverse proxy technology, the author deep analyzed the reverse proxy server architecture and key technologies. Through the G/S and the reverse proxy technology, the authors studied the reverse proxy system architecture of the G/S distributed cluster.Second, combination of the reverse proxy software named Squid, the author proposed a reverse proxy configuration of the G/ S mode.Thirdly, through the tests of two G/S cluster nodes and the tests of the communication between the two Squid servers, Squid was used in G/S distributed cluster very well.Through the application of Squid, two or more G/S cluster node could be interconnected.The test results indicated that user access to G/S server was much faster in the Squid reverse proxy configuration. The results of Stress tests showed that the response time was ideal and the performance of the system was excellent.These efforts will provide important technical supports for the research and application of G/S distributed clusters.