Apache 未设置CORS标头

我正在尝试从另一个域下载静态文件。在根目录中的my.htaccess文件中：

Header set Access-Control-Allow-Origin "*"
Header set Access-Control-Allow-Headers "Accept, If-Modified-Since, Origin"
Header set Access-Control-Allow-Methods "GET, OPTIONS"

这是一个请求-响应周期，浏览器将资源下载两次：

GET /file HTTP/1.1
Host: www.example.com
Accept: application/json
Origin: http://www.mydomain.com

HTTP/1.1 200 OK
Date: Sat, 07 Sep 2013 21:01:35 GMT
Server: Apache
Last-Modified: Sat, 07 Sep 2013 20:14:45 GMT
Content-Length: 2
Access-Control-Allow-Origin: *
Access-Control-Allow-Headers: Accept, If-Modified-Since, Origin
Access-Control-Allow-Methods: GET, OPTIONS
Content-Type: application/json

[]

GET /file HTTP/1.1
Host: www.example.com
Cache-Control: max-age=0
Accept: application/json
Origin: http://www.mydomain.com
If-Modified-Since: Sat, 07 Sep 2013 20:14:45 GMT

HTTP/1.1 304 Not Modified
Date: Sat, 07 Sep 2013 21:01:40 GMT
Server: Apache

---

第二次您可以看到，由于文件未被修改，服务器响应为

304 Not modified

。为什么没有为第二个响应设置CORS头？

这是一个apache错误，请参见下文

如果你觉得勇敢，你可以用补丁重新编译Apache