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本文主要解析一下nginx ngx_http_gzip_module以及ngx_http_gzip_static_module中的gzip相关配置参数。
gzip
| 名称 | 默认配置 | 作用域 | 官方说明 | 中文解读 | 模块 |
|---|---|---|---|---|---|
| gzip | gzip off; | http, server, location, if in location | Enables or disables gzipping of responses. | 设置是否开启对后端响应的gzip压缩，然后返回压缩内容给前端 | ngx_http_gzip_module |
| gzip_buffers | gzip_buffers 32 4k或16 8k; | http, server, location | Sets the number and size of buffers used to compress a response. By default, the buffer size is equal to one memory page. This is either 4K or 8K, depending on a platform. | 设置用于压缩后端response的buffer的数量和每个的大小，默认每个buffer大小为一个内存页，根据平台不同可能是4k或8k | ngx_http_gzip_module |
| gzip_comp_level | gzip_comp_level 1; | http, server, location | Sets a gzip compression level of a response. Acceptable values are in the range from 1 to 9. | 指定gzip压缩的级别，默认为1，该值可设置的范围是1-9，1为最小化压缩(处理速度快),9为最大化压缩(处理速度慢)，数字越大压缩的越好，也越占用CPU时间 | ngx_http_gzip_module |
| gzip_disable | 没有默认值 | http, server, location | Disables gzipping of responses for requests with User-Agent header fields matching any of the specified regular expressions. | 正则匹配User-Agent中的值，匹配上则不进行gzip | ngx_http_gzip_module |
| gzip_min_length | gzip_min_length 20; | http, server, location | Sets the minimum length of a response that will be gzipped. The length is determined only from the Content-Length response header field. | 设定进行gzip压缩的阈值，当后端response的Content-Length大小小于该值则不进行gzip压缩 | ngx_http_gzip_module |
| gzip_http_version | gzip_http_version 1.1; | http, server, location | Sets the minimum HTTP version of a request required to compress a response. | 设定进行gzip压缩的最小http版本 | ngx_http_gzip_module |
| gzip_proxied | gzip_proxied off; | http, server, location | Enables or disables gzipping of responses for proxied requests depending on the request and response. The fact that the request is proxied is determined by the presence of the “Via” request header field. | 根据request或响应的相关header的值来决定是否进行gzip | ngx_http_gzip_module |
| gzip_types | gzip_types text/html; | http, server, location | Enables gzipping of responses for the specified MIME types in addition to “text/html”. The special value “*” matches any MIME type (0.8.29). Responses with the “text/html” type are always compressed. | 指定哪些mime types启用gzip压缩，默认text/html | ngx_http_gzip_module |
| gzip_vary | gzip_vary off; | http, server, location | Enables or disables inserting the “Vary: Accept-Encoding” response header field if the directives gzip, gzip_static, or gunzip are active. | 是否往response header里头写入Vary: Accept-Encoding | ngx_http_gzip_module |
| gzip_static | gzip_static off; | http, server, location | Enables (“on”) or disables (“off”) checking the existence of precompressed files. The following directives are also taken into account: gzip_http_version, gzip_proxied, gzip_disable, and gzip_vary. | 开启之后，接到(静态文件)请求会到url相同的路径的文件系统去找扩展名为”.gz”的文件，如果存在直接把它发送出去，如果不存在，则进行gzip压缩，再发送出去 | ngx_http_gzip_static_module |
实例
http {
gzip on;
gzip_buffers 8 16k; ## 这个限制了nginx不能压缩大于128k的文件
gzip_comp_level 2;
gzip_disable "MSIE [1-6]\.(?!.*SV1)";
gzip_min_length 512; ##单位byte
gzip_http_version 1.0;
gzip_proxied expired no-cache no-store private auth;
gzip_types text/plain application/x-javascript text/css application/xml;
gzip_vary on;
gzip_static on;
//......
}