对响应给客户端的报文进行压缩，以节省网络带宽，但是会占用部分CPU性能，建议在后端服务器开启压缩功能，而非在HAProxy上开启压缩

配置选项

compression algo  <algorithm> ...         #启用http协议中的压缩机制，常用算法有gzip，deflate
<algorithm>支持下面类型：
  identity                                  #debug调试使用的压缩方式
  gzip                                      #常用的压缩方式，与各浏览器兼容较好
  deflate                                   #有些浏览器不支持
  raw-deflate                               #新式的压缩方式

compression type <mime type> ...          #要压缩的文件类型

#示例：
compression algo gzip deflate
compression type text/html text/csstext/plain 

配置示例

listen  web_host
  bind 10.0.0.7:80
  mode http
  balance  roundrobin
  log global
  option httplog
  compression algo gzip deflate
  compression type compression type text/plain text/html text/css text/xml text/javascript application/javascript
  server web1 10.0.0.17:80  cookie web1 check inter 3000 fall 3 rise 5
  server web2 10.0.0.27:80  cookie web2 check inter 3000 fall 3 rise 5

#后端服务器准备一个文本文件
[root@centos7 ~]#ll /var/www/html/m.txt  -h
-rwxr-xr-x 1 root root 772K Apr  2 12:56 /var/www/html/m.txt

验证压缩功能

[root@centos6 ~]#curl  -is --compressed   10.0.0.7/m.txt|less
HTTP/1.1 200 OK
date: Thu, 02 Apr 2020 05:00:26 GMT
server: Apache/2.4.6 (CentOS) PHP/5.4.16
last-modified: Thu, 02 Apr 2020 04:56:25 GMT
etag: W/"c0ef6-5a2479f7aee68"
accept-ranges: bytes
content-type: text/plain; charset=UTF-8
set-cookie: WEBSRV=web1; path=/
cache-control: private
content-encoding: deflate
transfer-encoding: chunked
vary: Accept-Encoding

Feb  2 18:49:27 centos7 journal: Runtime journal is using 6.0M (max allowed 48.6M, trying to leave 72.9M free of 480.1M available → current limit 48.6M).
Feb  2 18:49:27 centos7 kernel: Initializing cgroup subsys cpuset
Feb  2 18:49:27 centos7 kernel: Initializing cgroup subsys cpu
Feb  2 18:49:27 centos7 kernel: Initializing cgroup subsys cpuacct
......

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