Nginx gzip compression boosts website speed

One: Nginx gzip compression boost website speed

We're looking at News.163.com's head information.

Request:

Accept-encoding:gzip,deflate,sdch

Response:

Content-encoding:gzip

content-length:36093

Then save the page, observe, about 10W bytes, the actual transmission of 36093 bytes

The reason-------is gzip compression.

Principle:

Browser---Request----> claims can accept gzip compression or deflate compression or compress or SDCH compression

From the point of view of the HTTP protocol-the request header declaration Acceopt-encoding:gzip deflate SDCH (refers to the compression algorithm, which SDCH is a compression method advocated by Google, currently support a few servers)

Server-to-response---compress content in gzip----> Send to Browser

Browse <-----decode gzip-----Receive gzip compressed content----

Calculate the bandwidth savings:

Suppose news.163.com PV 200 million

2*10^8 * 9*10^4 bytes = =

2*10^8 * 9 * 10^4 * 10^-9 = 12*k*g = 18T

The bandwidth savings are very alarming.

Common parameters for gzip configuration

Gzip On|off; #是否开启gzip

Gzip_buffers 4k| 8K #缓冲 (compression buffers a few blocks in memory? How big is each chunk?)

Gzip_comp_level [1-9] #推荐6 compression level (the higher the level, the smaller the pressure, the more wasted CPU computing resources)

Gzip_disable #正则匹配UA What kind of Uri does not perform gzip

Gzip_min_length 200 # Start compressing the minimum length (no more small, no compression, meaning not)

Gzip_http_version 1.0|1.1 # Start Compressed HTTP protocol version (can not be set, currently almost all 1.1 protocol)

Gzip_proxied # Set the requestor proxy server, how to cache the content

Gzip_types Text/plain Application/xml # for which types of files are compressed such as txt,xml,html, CSS

Gzip_vary On|off # Whether to transmit GZIP compression flag

------Compressed gzip Configuration--------------

Configuring in Server Fault

server{

gzip on;

Gzip_buffers 4k;

Gzip_comp_level 6;

Gzip_min_length 200;

Gizp_type text/css Text/xml Applocation/x-javascript;

}

---------------------------

Attention:

Picture/mp3 Such a binary file that does not have to be compressed

Because the compression ratio is smaller, such as 100->80 bytes, and compression is CPU-intensive.

Smaller files do not have to be compressed,

Nginx gzip compression boosts website speed