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我创建了一个页面，该页面将采用 css（或 javascript）文件并将它们作为一个文件输出。我注意到，当我使用以下命令压缩输出时，Firefox 和 Internet Explorer 在任何时候都无法发送“If-Modified-Since”标头ob_gzhandler：

if(!ob_start("ob_gzhandler")) ob_start();

初始标头（示例中更改了主机和引用者）：

Response Headers
Cache-Control   public, must-revalidate, maxage=4838400
Connection  keep-alive
Content-Encoding    gzip
Content-Length  87281
Content-Type    text/css; charset: UTF-8
Date    Wed, 12 Dec 2012 16:04:32 GMT
Expires Wed, 06 Feb 2013 16:04:32 GMT
Last-Modified   Fri, 12 Oct 2012 13:47:18 GMT
Pragma  public
Server  Apache
Vary    Accept-Encoding
X-Cache MISS from localhost
X-Powered-By    PHP/5.3.13

Request Headers
Accept  text/css,*/*;q=0.1
Accept-Encoding gzip, deflate
Accept-Language en-gb,en;q=0.5
Authorization   Basic cmVkZnVzZTpyM2RmdXMz
Cache-Control   no-cache
Connection  keep-alive
Cookie  PHPSESSID=e73355c49f06a059c22d7f02687dc51b
DNT 1
Host    example.com
Pragma  no-cache
Referer http://example.com/
User-Agent  Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20100101 Firefox/17.0

刷新时发送以下标头（示例中更改了主机和引荐来源网址）：

Response Headers
Cache-Control   public, must-revalidate, maxage=4838400
Connection  keep-alive
Content-Encoding    gzip
Content-Length  87245
Content-Type    text/css; charset: UTF-8
Date    Wed, 12 Dec 2012 16:09:11 GMT
Expires Wed, 06 Feb 2013 16:09:11 GMT
Last-Modified   Fri, 12 Oct 2012 13:47:18 GMT
Pragma  public
Server  Apache
Vary    Accept-Encoding
X-Cache MISS from localhost
X-Powered-By    PHP/5.3.13

Request Headers
Accept  text/css,*/*;q=0.1
Accept-Encoding gzip, deflate
Accept-Language en-gb,en;q=0.5
Authorization   Basic cmVkZnVzZTpyM2RmdXMz
Cache-Control   max-age=0
Connection  keep-alive
Cookie  PHPSESSID=e73355c49f06a059c22d7f02687dc51b
DNT 1
Host    example.com
Referer example.com
User-Agent  Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20100101 Firefox/17.0

如果我从使用切换ob_gzhandler到标准ob_start()，那么它可以正常工作并在第二次加载时按预期返回 304。

我认为相关的另一个问题是，从 android 设备查看时，css 既不适用于股票浏览器，也不适用于 Dolphin 浏览器，但适用于 Firefox for Android。这也可以通过禁用ob_gzhandler

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