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I have been working in ASP.NET MVC for a while now, but one thing that has confused me about it is the difficulty involved in modifying HTTP Headers. It is simple enough to add headers (Response.AppendHeader(...);), and it is very (almost too) simple to remove all headers (Response.ClearHeaders();). But when it comes to modifying and deleting individual headers, there's trouble.

What is the technical reason behind the http headers collection being more than (essentially) a simple Dictionary<string, string> that gets written to the response stream? Why is it so easy to remove all, but impossible to remove an individual?

Note - I am not only concerned with running it on the server (using IIS 7, integrated pipeline mode), but also in development (using Cassini).

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对于 .Net Framwork 3.0、IIS 7.0/集成模式：

如您所见，

Response

对象有

Headers

键入为 NameValueCollection 的属性（我不确定为什么选择了这种类型） http://msdn.microsoft.com/en-us/library/system.web.httpresponse.headers

因此，理论上，您可以使用它在问题中概述的响应中添加或删除标题。

正如我从 Response.AddHeader 源代码中看到的（我使用了 Reflector），几乎没有额外的检查。例如，如果您在调用“Flush”方法后尝试添加处理程序，该方法将引发异常（如果您考虑一下，这是一个正确的行为）。我不确定为什么微软人员公开了 Headers 属性，以及它背后的想法是什么。我认为它至少应该受到保护，因为幕后还有其他逻辑，并且在某些情况下，该过程不限于简单的数组项插入。

于 2012-05-22T22:16:10.063 回答