PHP会话修改了缓存控制标头? [英] Cache-Control Header Modified By PHP Session?
问题描述
我正在使用Zend_Controller_Response对象将图像输出到浏览器.我打算将缓存应用于图像，但是某些原因导致Cache-Control标头被覆盖.
I'm outputting an image to the browser using a Zend_Controller_Response object. It is my intention to apply caching to the image, however something is causing the Cache-Control header to be overwritten.
我的代码如下:
$this->getResponse()
->setHeader('Last-Modified', $modifiedTime, true)
->setHeader('ETag', md5($modifiedTime), true)
->setHeader('Expires', $expires, true)
->setHeader('Pragma', '', true)
->setHeader('Cache-Control', 'max-age=3600')
->setHeader('Content-Type', $mimeType, true)
->setHeader('Content-Length', $size, true)
->setBody($data);
输出(在Firebug中查看)为:
The output (as viewed in Firebug) is:
响应标题
- 日期
- 星期三，2009年3月25日格林尼治标准时间
- 服务器
- Apache/2.2.3(Ubuntu)mod_ssl/2.2.3 OpenSSL/0.9.8c
- 到期
- 2009年3月26日，星期四，格林尼治标准时间
- 缓存控制
- 无存储，无缓存，必须重新验证，后检查= 0，预检查= 0，最大年龄= 3600
- 最后修改
- 1234872514
- Etag
- d3ef646c640b689b0101f3e03e08a524
- 内容长度
- 1452
- 与X-UA兼容
- IE = EmulateIE7
- X-Robots-Tag
- noindex
- 保持活动
- 超时= 15，最大= 100
- 连接
- 保持活动
- Content-Type
- image/jpeg
- Date
- Wed, 25 Mar 2009 10:34:40 GMT
- Server
- Apache/2.2.3 (Ubuntu) mod_ssl/2.2.3 OpenSSL/0.9.8c
- Expires
- Thu, 26 Mar 2009 10:34:41 GMT
- Cache-Control
- no-store, no-cache, must-revalidate, post-check=0, pre-check=0, max-age=3600
- Last-Modified
- 1234872514
- Etag
- d3ef646c640b689b0101f3e03e08a524
- Content-Length
- 1452
- X-UA-Compatible
- IE=EmulateIE7
- X-Robots-Tag
- noindex
- Keep-Alive
- timeout=15, max=100
- Connection
- Keep-Alive
- Content-Type
- image/jpeg
请求标头
- 主机
- 大厅.####.###.######.com
- User-Agent
- Mozilla/5.0(X11; U; Linux i686; en-US; rv:1.9.0.7)Gecko/2009030422 Ubuntu/8.04(hardy)Firefox/3.0 .7
- 接受
- text/html，application/xhtml + xml，application/xml; q = 0.9，*/*; q = 0.8
- 接受语言
- en-gb，en; q = 0.5
- 接受编码
- gzip，放气
- Accept-Charset
- ISO-8859-1，utf-8; q = 0.7，*; q = 0.7
- 保持活动
- 300
- 连接
- 保持活动
- Referer
- http://khall.####.###.######.com/
- Cookie
- PHPSESSID = abf5056e1289d3010448107632a1c1bd
- Host
- khall.####.###.######.com
- User-Agent
- Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.7) Gecko/2009030422 Ubuntu/8.04 (hardy) Firefox/3.0 .7
- Accept
- text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
- Accept-Language
- en-gb,en;q=0.5
- Accept-Encoding
- gzip,deflate
- Accept-Charset
- ISO-8859-1,utf-8;q=0.7,*;q=0.7
- Keep-Alive
- 300
- Connection
- keep-alive
- Referer
- http://khall.####.###.######.com/
- Cookie
- PHPSESSID=abf5056e1289d3010448107632a1c1bd
如您所见，缓存控件被修改为包括:
As you can see, the cache control is modified to include:
无存储，无缓存，必须重新验证，后检查= 0，预检查= 0
no-store, no-cache, must-revalidate, post-check=0, pre-check=0
我怀疑请求中发送的会话cookie.有人知道一种发送我所需的标头的方法，但仍将会话保留在请求中吗?我的应用程序通过引导程序运行，并且使用Zend_Session处理会话.
My suspicion is towards the session cookie being sent in the request. Does anybody know a way to send the header that I require, yet still keep the session in the request? My application is run through a bootstrap, and sessions are handled using Zend_Session.
任何帮助将不胜感激.
推荐答案
在Zend_Controller文档中， 10.9.响应对象
From the Zend_Controller documentation, section 10.9. The Response Object
setHeader($ name，$ value，$ replace = false)用于设置个人 标头.默认情况下，它不 替换相同的现有标头 对象中的名称；但是，设置 $ replace为true将迫使它去做 如此.
setHeader($name, $value, $replace = false) is used to set an individual header. By default, it does not replace existing headers of the same name in the object; however, setting $replace to true will force it to do so.
您遇到的问题是，将max-age = 3600附加到了缓存控制标头中，而不是替换它.尝试将 $ replace 参数设置为 true .
The problem you are having is your max-age=3600 is being appended to the cache-control header, as opposed to replacing it. Try setting the $replace parameter to true.
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