Responce.AppendHeader有什么用（字符串名称，字符串值） [英] What is the use of Responce.AppendHeader(string name,string value )

问题描述

嗨朋友

i正在处理一些项目，我在页面加载中得到了这个方法（Responce.AppendHeader（字符串名称，字符串值））

谢谢你提前

Hi friends
i am working on some project,there i got this methdod( Responce.AppendHeader(string name,string value )) in the page load
Thank u in advance

推荐答案

如果使用AppendHeader方法发送特定于缓存的标头，同时使用缓存对象模型（Cache）来设置缓存策略，HTTP当使用缓存对象模型时，可能会删除与缓存（Cache-Control，Expires，Last-Modified，Pragma和Vary）相关的响应头。此行为使ASP.NET能够维护最严格的设置。例如，考虑包含用户控件的页面。如果这些控件具有冲突的缓存策略，则将使用限制性最强的缓存策略。如果一个用户控件设置标题Cache-Control：Public，而另一个用户控件通过调用SetCacheability设置限制性更强的标题Cache-Control：Private，那么Cache-Control：Private标题将随之发送回复。



参考

http://msdn.microsoft.com/en-us/library/system.web.httpresponse.appendheader（v = vs.110）的.aspx [ ^ ]

If you use the AppendHeader method to send cache-specific headers and at the same time use the cache object model (Cache) to set cache policy, HTTP response headers that pertain to caching (Cache-Control, Expires, Last-Modified, Pragma, and Vary) might be deleted when the cache object model is used. This behavior enables ASP.NET to maintain the most restrictive settings. For example, consider a page that includes user controls. If those controls have conflicting cache policies, the most restrictive cache policy will be used. If one user control sets the header "Cache-Control: Public" and another user control sets the more restrictive header "Cache-Control: Private" via calls to SetCacheability, then the "Cache-Control: Private" header will be sent with the response.

Ref
http://msdn.microsoft.com/en-us/library/system.web.httpresponse.appendheader(v=vs.110).aspx[^]

我想到的第一件事：如果你不知道为什么附加标题，你可能不需要它为你的项目（您没有费心去讨论）:-)。



我无法理解为什么如此清晰的原始MSDN文档需要一些额外的解释： http://msdn.microsoft.com/en-us/library/system.web.httpresponse.appendheader%28v=vs.110%29.aspx [ ^ ]。



这个问题的唯一原因可能是：您不知道为什么标题用于所有。这意味着您应该了解HTTP的工作原理，特别是这些标题的作用：

http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol [ ^ ]，

http://en.wikipedia.org/wiki/List_of_HTTP_header_fields [ ^ ]。

-SA

First thing which comes to my mind: if you don't know why appending a header, you probably don't need it for your project (which you did not bother to talk about) :-).

I cannot understand why so clear original MSDN documentation needs some extra explanations: http://msdn.microsoft.com/en-us/library/system.web.httpresponse.appendheader%28v=vs.110%29.aspx[^].

Probably the only reason of such question could be this: you have no idea why the headers are used at all. It would mean that you should learn how HTTP works, and, in particular, the role of those headers:
http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol[^],
http://en.wikipedia.org/wiki/List_of_HTTP_header_fields[^].

—SA

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