随着对万维网使用的增多 ,人们对网络的有效性、性能和安全更加关注。目前 ,事实上因特网上的所有用户都是易受攻击的 ,网络安全问题已经成为人们关注的焦点 ,并对计算机和电信工业带来了恐慌。本文论述了一种过滤式代理服务器设计和实现的细节。通过该代理服务器 ,防火墙后面的客户系统可以有效地访问Web服务器 ,并且其本身安全并不受到威胁。此外 ,本文还介绍了一种通过删除GIF动画来克服带宽瓶颈问题和通过地址转换来解决IP地址紧缺的方法。 With the increased use of the World Wide Web, there is a growing concern about the effectiveness, performance and security of the network. At present, virtually all users on the Internet are vulnerable and cyber-security issues have become the focus of attention and panicked to the computer and telecommunications industries. This article discusses the details of a filter proxy server design and implementation. Through this proxy server, the client system behind the firewall provides effective access to the Web server and is inherently safe from threats. In addition, this article also describes a way to overcome bandwidth bottlenecks by deleting GIF animations and address IP address shortage through address translation.