如果是wordpress博客使用了wp super cache缓存插件，并且在设置里面也开启了压缩的话可以不使用下面方法。
1.登陆Cpanel面板，点击“优化网站”

2.勾选“压缩被指定的多用因特网邮件扩展（标准）类型”

3.在多用因特网邮件扩展（标准）类型中填

text/html text/plain text/xml text/css application/x-httpd-php application/x-javascript

或者是

1.登陆Cpanel面板，点击“优化网站”

2.勾选“压缩所有内容”

3.“更新设置”

方法2：改.htaccess文件

<IfModule mod_deflate.c>
AddOutPutFilterByType DEFLATE text/html text/plain text/xml
<IfModule mod_setenvif.c>
# Netscape 4.x has some problems…
BrowserMatch ^Mozilla/4 gzip-only-text/html

# Netscape 4.06-4.08 have some more problems
BrowserMatch ^Mozilla/4\.0[678] no-gzip

# MSIE masquerades as Netscape, but it is fine
# BrowserMatch \bMSIE !no-gzip !gzip-only-text/html

# NOTE: Due to a bug in mod_setenvif up to Apache 2.0.48
# the above regex won’t work. You can use the following
# workaround to get the desired effect:
BrowserMatch \bMSI[E] !no-gzip !gzip-only-text/html

# Don’t compress images
SetEnvIfNoCase Request_URI .(?:gif|jpe?g|png)$ no-gzip dont-vary
</IfModule>

<IfModule mod_headers.c>
# Make sure proxies don’t deliver the wrong content
Header append Vary User-Agent env=!dont-vary
</IfModule>
</IfModule>