安道生網站技術練功房 - 分享經驗，累積智慧

網頁壓縮可以節省傳輸頻寬，同時也節省傳輸時間(不過如果加上CPU運算的時間可能會打點折）
先檢查網站有沒有支援HTTP Compression
http://www.seoconsultants.com/tools/compression.asp
如果沒有的話，Apache 2的mod_deflate模組可幫我們完成這個任務
由於CentOS 4.4 預設安裝的Apache 2已將安裝好mod_deflate.so，所以我們只要將下列的設定加到/etc/httpd/conf/httpd.conf即可

<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|jpe?g|png)$ no-gzip dont-vary    
    
    # Make sure proxies don't deliver the wrong content
    Header append Vary User-Agent env=!dont-vary
</Location>

重新啟動Apache，再到上面的網站檢查看看，如果出現Compressed (gzip)，就成功了。