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Nginx 的 sub_filter 模块（http://wiki.nginx.org/HttpSubModule）来替换返回文件中的文本。可以用来不修改应用程序的同时，为文件增加一些监控标志，或增加额外的 javascript 用于数据统计等，使用方式如下： location / { sub_filter </head>
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'</head><script language="javascript" src="$script"></script>'; sub_filter_once on; }
当然方式可以更灵活，比如插入 google analytics 代码等等。 但如果后端返回的文件是已经 gzip 压缩过的文件，因为需要解压缩，然后再压缩，sub_filter 不支持gzip。为了避免此种情况，我们需要后端不压缩文件，做法就是去除 HTTP 请求头中的 压缩头，指导后端不压缩： proxy_set_header Accept-Encoding ""; 当然，为了保证到浏览器的数据是压缩的，sub_filter 前端还是需要配置 gzip on 的。 (责任编辑：IT) |