filter过滤器应用，gzip压缩，测试百度页面，谷歌页面，和自己的应用页面，二进制文本等压缩率-filter filter applications, gzip compression, test Baidu page, Google pages, and their application pages, text and other binary compression

简单的GZipFilter程序代码，写的不好请见谅-A simple GZipFilter program code, badly written, please forgive me