Etag 没有从 css、js 和图像中取出？答案

【问题标题】：Etag's are not being taken out of css,js, and images?Etag 没有从 css、js 和图像中取出？
【发布时间】：2011-11-27 01:40:47
【问题描述】：

我正在尝试通过使用 mod_deflate 和 mod_headers 来降低网站的加载速度，这会压缩内容并设置过期日期，但也会删除我的内容的 ETag。但是，根据 Yslow，它不会从我的图像（png）、css 和 js 中删除 ETag。

我的 .htaccess 代码：

<IfModule mod_deflate.c>
    <IfModule mod_setenvif.c>
        <IfModule mod_headers.c>
            SetEnvIfNoCase ^(Accept-EncodXng|X-cept-Encoding|X{15}|~{15}|-{15})$ ^((gzip|deflate)\s*,?\s*)+|[X~-]{4,13}$            HAVE_Accept-Encoding
            RequestHeader append Accept-Encoding "gzip,deflate" env=HAVE_Accept-Encoding
        </IfModule>
    </IfModule>
    <IfModule filter_module>
        FilterDeclare   COMPRESS
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/html
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/css
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/plain
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/xml
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $text/x-component
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/javascript
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/json
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/xml
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/xhtml+xml
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/rss+xml
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/atom+xml
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/vnd.ms-fontobject
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $image/svg+xml
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $application/x-font-ttf
        FilterProvider  COMPRESS  DEFLATE resp=Content-Type $font/opentype
        FilterChain     COMPRESS
        FilterProtocol  COMPRESS  DEFLATE change=yes;byteranges=no
    </IfModule>
    <IfModule !mod_filter.c>
        # Legacy versions of Apache
        AddOutputFilterByType DEFLATE text/html text/plain text/css application/json
        AddOutputFilterByType DEFLATE application/javascript
        AddOutputFilterByType DEFLATE text/xml application/xml text/x-component
        AddOutputFilterByType DEFLATE application/xhtml+xml application/rss+xml application/atom+xml
        AddOutputFilterByType DEFLATE image/svg+xml application/vnd.ms-fontobject application/x-font-ttf font/opentype
    </IfModule>
</IfModule>
<IfModule mod_expires.c>
    ExpiresActive on
    ExpiresDefault                          "access plus 1 month"
    ExpiresByType text/cache-manifest       "access plus 0 seconds"
    ExpiresByType text/html                 "access plus 0 seconds"
    ExpiresByType text/xml                  "access plus 0 seconds"
    ExpiresByType application/xml           "access plus 0 seconds"
    ExpiresByType application/json          "access plus 0 seconds"
    ExpiresByType application/rss+xml       "access plus 1 hour"
    ExpiresByType image/x-icon              "access plus 1 month" 
    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"
    ExpiresByType text/x-component          "access plus 1 month"
    ExpiresByType font/truetype             "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"
    ExpiresByType text/css                  "access plus 1 year"
    ExpiresByType application/javascript    "access plus 1 year"
    ExpiresByType text/javascript           "access plus 1 year"
    <IfModule mod_headers.c>
        Header append Cache-Control "public"
    </IfModule>
</IfModule>
<IfModule mod_headers.c>
    Header unset ETag
</IfModule>
FileETag None

取自：http://html5boilerplate.com/

【问题讨论】：

自己检查标题。可能是 YSlow 是错误的。可能是你的浏览器缓存搞砸了。
使用铬。在开发人员工具下，使用网络选项卡。或者在 firefox 中使用 Firebugs net tab
您也可以检查带有Curl的标头，例如curl --head http://www.example.com/file.png，并在响应中查找ETag标头。

标签： .htaccess compression etag yslow

【解决方案1】：

我想我明白了..

YSlow 正在缓存结果。更改浏览器（从 Safari 到 Firefox）似乎表明 ETag 实际上已被删除。

【讨论】：

查理，你可能想在这里“接受”你自己的答案，所以这显示为已解决。