ASP.net AppendHeader 无法在 ASP MVC 中工作
如果我还使用授权过滤器,那么我在使 AppendHeader 正常工作时遇到问题。我在 AJAX 操作中使用了一个 actionfilter,它应用了 Expires、Last-Modified、Cache-Control 和 Pragma(尽管在测试时我尝试将其包含在操作方法本身中,结果没有任何变化)。
如果我没有授权过滤器,则标头可以正常工作。添加过滤器后,我尝试添加的标头就会被删除。
我想要添加的标题
Response.AppendHeader("Expires", "Sun, 19 Nov 1978 05:00:00 GMT"); Response.AppendHeader("Last-Modified", String.Format("{0:r}", DateTime.Now)); Response.AppendHeader("Cache-Control", "no-store, no-cache, must-revalidate"); Response.AppendHeader("Cache-Control", "post-check=0, pre-check=0"); Response.AppendHeader("Pragma", "no-cache");
正确页面的标题示例:
Server ASP.NET Development Server/9.0.0.0 Date Mon, 14 Jun 2010 17:22:24 GMT X-AspNet-Version 2.0.50727 X-AspNetMvc-Version 2.0 Pragma no-cache Expires Sun, 19 Nov 1978 05:00:00 GMT Last-Modified Mon, 14 Jun 2010 18:22:24 GMT Cache-Control no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Content-Type text/html; charset=utf-8 Content-Length 352 Connection Close
以及错误页面的标题示例:
Server ASP.NET Development Server/9.0.0.0 Date Mon, 14 Jun 2010 17:27:34 GMT X-AspNet-Version 2.0.50727 X-AspNetMvc-Version 2.0 Pragma no-cache, no-cache Cache-Control private, s-maxage=0 Content-Type text/html; charset=utf-8 Content-Length 4937 Connection Close
I'm having problems getting AppendHeader to work properly if I am also using an authorize filter. I'm using an actionfilter for my AJAX actions that applies Expires, Last-Modified, Cache-Control and Pragma (though while testing I have tried including it in the action method itself with no change in results).
If I don't have an authorize filter the headers work fine. Once I add the filter the headers I tried to add get stripped.
The headers I want to add
Response.AppendHeader("Expires", "Sun, 19 Nov 1978 05:00:00 GMT"); Response.AppendHeader("Last-Modified", String.Format("{0:r}", DateTime.Now)); Response.AppendHeader("Cache-Control", "no-store, no-cache, must-revalidate"); Response.AppendHeader("Cache-Control", "post-check=0, pre-check=0"); Response.AppendHeader("Pragma", "no-cache");
An example of the headers from a correct page:
Server ASP.NET Development Server/9.0.0.0 Date Mon, 14 Jun 2010 17:22:24 GMT X-AspNet-Version 2.0.50727 X-AspNetMvc-Version 2.0 Pragma no-cache Expires Sun, 19 Nov 1978 05:00:00 GMT Last-Modified Mon, 14 Jun 2010 18:22:24 GMT Cache-Control no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Content-Type text/html; charset=utf-8 Content-Length 352 Connection Close
And from an incorrect page:
Server ASP.NET Development Server/9.0.0.0 Date Mon, 14 Jun 2010 17:27:34 GMT X-AspNet-Version 2.0.50727 X-AspNetMvc-Version 2.0 Pragma no-cache, no-cache Cache-Control private, s-maxage=0 Content-Type text/html; charset=utf-8 Content-Length 4937 Connection Close
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要管理输出缓存,您可以使用 OutputCache 属性操作
编辑
如果您正在查看 AuthorizeAttribute 源代码,您将看到它覆盖了输出缓存策略,原因在此代码的注释中:
To manage the output cache you can use OutputCache attribute on your Action
EDIT
If you are looking to the AuthorizeAttribute source code, you will see it overrides the output cache policy and the reason is in comments in this code: