Detailed explanation of dynamic compression and static compression of gzip

Gzip The compression of is divided into dynamic compression and static compression . Dynamic compression is simply nginx The resources on are in the form of original files , Compress it when it is returned to the browser , The browser receives the compressed file and decompresses it . Static compression is nginx The resource on is not the original file , It is a compressed file compressed in advance , Directly back to the browser , The browser will decompress .

One 、Gzip Dynamic compression

Be careful ：gzip After dynamic compression of is enabled ,sendfile Zero copy of is invalid .

Scope http, server, location

Configuration parameter description ：

1、gzip on;

switch , Off by default

2、gzip_buffers 32 4k

Buffer size , Ahead 32 To express with 32 Buffers , Next, the size of each buffer is 4K,32 Bit operating system recommended configuration 32 4k,64 Bit operating system recommended configuration 16 8k

3、gzip_comp_level 1;

Compression level 1-9, The larger the number, the higher the compression ratio

4、gzip_http_version 1.1;

Use gzip The smallest version of

5、gzip_min_length

Settings will be gzip Minimum length of compressed response . Length only by “Content-Length” The response header field is determined . Compress only after exceeding this value , Less than this value will not compress . With K In units of , The duty of 0 when , All pages are compressed

6、gzip_proxied

As a reverse agent , Judge whether to compress according to the header information returned by the upstream server , If nginx Not as a reverse proxy server , For example, static resource server , be gzip_proxied Invalid configuration

gzip_proxied Are the following parameters , Multiple values can be selected ：

• off Turn off compression of data for all agent results
• expired - Qi