Apache deflate模块配置说明
前几天一直在找apache2.0以dso方式编译后加载deflate模块的办法
试了apxs -ica mod_deflate.cN次，始终是报
Cannot load /opt/apache/modules/mod_deflate.so into server: /opt/apache/modules/mod_deflate.so: undefined symbol: deflate
异常的痛苦，什么ldd mod_deflate.so后再export LIB_LIBRARY_PATH呀，都试了N次，google也go了N天。终于在google上go出来一篇文章，终于解决，方法如下：
vi /usr/local/apache2/bin/apr-config
修改LDFLAGS= 为 LDFLAGS=-lz
然后再apxs -ica mod_deflate.c
就OK了
另外在配置deflate规则时
apache2.0推荐加上这句
Header append Vary User-Agent env=!dont-vary
以便确保不会输出在压缩过程中出现内容方面的error
但一般情况下，在测试apache的语法过程中会现出
Invalid command 'Header', perhaps mis-spelled or defined by a module not included in the server configuration
解决办法就是加载一个headers模块就OK了
不过最好还是在编译apache模块时直接加上--enable-deflate --enable-headers就省事多了。
一、 需求
压缩apache的输出内容，降低网站带宽
二、 加载Apache的deflate模块
1、 修改apr-config
vi /usr/local/apache2/bin/apr-config
修改LDFLAGS= 为 LDFLAGS=-lz
2、 到apache源安装目录下,例如
cd /root/httpd-2.0.55/modules/filters
3、加载mod_deflate模块
/usr/local/apache2/bin/apxs -i -a -c mod_deflate.c
如果没有安装headers模块，加载headers模块
cd /root/httpd-2.0.55/modules/metadata
加载mod_headers模块
/usr/local/apache2/bin/apxs -i -a –c mod_headers.c
三、配置Apache主配置文件
1. 在httpd.conf主配置文件里添加如下行
#声明输入流的byte数量
DeflateFilterNote Input instream
#声明输出流的byte数量
DeflateFilterNote Output outstream
#声明压缩的百分比
DeflateFilterNote Ratio ratio
#声明日志类型
LogFormat '%r %{outstream}n/%{instream}n (%{ratio}n%%)' deflate
CustomLog logs/deflate_log deflate
#指定压缩参数
<Location />
# Insert filter
SetOutputFilter DEFLATE
# 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|jpg|cab|jpe?g|exe|bmp|mp3|rar|zip|swf|png)$ no-gzip dont-vary
# Make sure proxies don't deliver the wrong content
Header append Vary User-Agent env=!dont-vary
</Location>
二、日志输出格式如下
[root@trffic2 logs]# tail -f access_log
GET /apache_pb.gif HTTP/1.1 -/- (-%)
GET /manual/ HTTP/1.1 2163/7434 (29%)
GET /manual/style/css/manual.css HTTP/1.1 3973/18335 (21%)
GET /manual/style/css/manual-loose-100pc.css HTTP/1.1 1006/2882 (34%)
GET /manual/style/css/manual-print.css HTTP/1.1 2994/13017 (23%)
原文：http://www.ceass.com/index.php?play=reply&id=90
本文转摘自『IT学习者』http://www.itlearner.com/article/2007/3819.shtml
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