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详情：此书第52页中提到ngx_http_gzip_module为标准HTTP模块。而在第53页中此模块变成了可选HTTP模块，自相矛盾，查了官网，此模块确实为标准HTTP模块，即会默认安装。
The
ngx_http_gzip_modulemodule is a filter that compresses responses using the “gzip” method. This often helps to reduce the size of transmitted data by half or even more.http://nginx.org/en/docs/http/ngx_http_gzip_module.html#gzip
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原文地址：http://my.oschina.net/zhaomy/blog/361015
