.htaccess负责gzip编码和缓存，但YSlow在这两个方面都报告了“F”

Question

我对gzip压缩和缓存等优化技术是新手。在网上做了一些研究之后，我意识到这是可能的。htaccess基于一些apache处理程序。我询问了我的网络主机，想知道mod_deflate和mod_headers库是否存在并且可用

我甚至查过firebug。它显示请求头“Accept Encoding gzip，deflate”，但响应字段中没有“内容编码”。有人能帮我找出哪里出了问题吗？

以下是. htaccess文件的代码

            Options -Indexes
            Options +FollowSymlinks
            RewriteEngine on

            RewriteBase /
            RewriteCond %{REQUEST_FILENAME} !-f
            RewriteCond %{REQUEST_FILENAME} !-d
            RewriteRule . /index.php [L]

            <IfModule mod_deflate.c>
            AddOutputFilterByType DEFLATE application/x-javascript
            AddOutputFilterByType DEFLATE text/css text/html text/plain text/xml
            DeflateCompressionLevel 9
            </IfModule>


            # ----------------------------------------------------------------------
            # Expires headers (for better cache control)
            # ----------------------------------------------------------------------

            # These are pretty far-future expires headers.
            # They assume you control versioning with filename-based cache busting
            # Additionally, consider that outdated proxies may miscache
            # www.stevesouders.com/blog/2008/08/23/revving-filenames-dont-use-querystring/

            # If you don't use filenames to version, lower the CSS and JS to something like
            # "access plus 1 week" or so.

            <IfModule mod_expires.c>
              ExpiresActive on

            # Perhaps better to whitelist expires rules? Perhaps.
              ExpiresDefault "access plus 1 month"

            # cache.appcache needs re-requests in FF 3.6 (thanks Remy ~Introducing HTML5)
              ExpiresByType text/cache-manifest "access plus 0 seconds"

            # Your document html
              ExpiresByType text/html "access plus 0 seconds"

            # Data
              ExpiresByType text/xml "access plus 0 seconds"
              ExpiresByType application/xml "access plus 0 seconds"
              ExpiresByType application/json "access plus 0 seconds"

            # Feed
              ExpiresByType application/rss+xml "access plus 1 hour"
              ExpiresByType application/atom+xml "access plus 1 hour"

            # Favicon (cannot be renamed)
              ExpiresByType image/x-icon "access plus 1 week"

            # Media: images, video, audio
              ExpiresByType image/gif "access plus 1 month"
              ExpiresByType image/png "access plus 1 month"
              ExpiresByType image/jpg "access plus 1 month"
              ExpiresByType image/jpeg "access plus 1 month"
              ExpiresByType video/ogg "access plus 1 month"
              ExpiresByType audio/ogg "access plus 1 month"
              ExpiresByType video/mp4 "access plus 1 month"
              ExpiresByType video/webm "access plus 1 month"

            # HTC files (css3pie)
              ExpiresByType text/x-component "access plus 1 month"

            # Webfonts
              ExpiresByType application/x-font-ttf "access plus 1 month"
              ExpiresByType font/opentype "access plus 1 month"
              ExpiresByType application/x-font-woff "access plus 1 month"
              ExpiresByType image/svg+xml "access plus 1 month"
              ExpiresByType application/vnd.ms-fontobject "access plus 1 month"

            # CSS and JavaScript
              ExpiresByType text/css "access plus 1 year"
              ExpiresByType application/javascript "access plus 1 year"

            </IfModule>

Answer 1

您确定主机提供程序已启用这两个模块吗？您是否检查过同一提供商中托管的其他网站？有时小型主机提供商会关闭共享计划上的mod_deflate以节省一些CPU，从而增加共享。

尝试卷曲您网站上的任何js资源，例如：

curl -I "http://yslow.org/yslow-bookmarklet.js" -H "Accept-Encoding: gzip, deflate"

你应该得到类似于：

HTTP/1.1 200 OK
Server: nginx/1.0.13
Date: Wed, 06 Jun 2012 18:31:25 GMT
Content-Type: application/x-javascript
Last-Modified: Fri, 25 May 2012 16:11:28 GMT
Connection: keep-alive
Expires: Thu, 07 Jun 2012 18:31:25 GMT
Cache-Control: max-age=86400
Content-Encoding: gzip

查找内容编码以确保mod_deflate处于启用状态，并且过期和缓存控制用于mod_过期。