ASP.NET Cache.SetCacheability（HttpCacheability.Public）未设置头 [英] ASP.NET Cache.SetCacheability(HttpCacheability.Public) not setting header

问题描述

我有检索存储在数据库中的图像，并将其写入到响应一个HttpHandler（也做到了这一点作为一个ASPX页面）。我添加了以下行code，试图让图像缓存在浏览器中，但每当我看着萤火虫的反应，它总是有私有缓存控制标头值。

I have an HttpHandler (have also done this as an ASPX page) that retrieves an image stored in the db and writes it out to the response. I have added the following lines to the code to try and get the images to cache in the browser, but whenever I look at the response in Firebug, it always has a cache-control header value of "private".

Response.Cache.SetCacheability(HttpCacheability.Public)

我已经尝试了各种东西，喜欢用Response.ClearHeaders＆放大器; Response.AddHeader（）来手动添加缓存控制头值，但无济于事。任何想法？

I've tried all sorts of things, like using the Response.ClearHeaders & Response.AddHeader() to manually add the "Cache-Control" header value, but to no avail. Any ideas?

编辑：结果
更多信息：这是一个HTTP处理程序（ashx的）运行，并且我已经测试它都在我的本地IIS 5.1，并在托管网站我认为这是IIS 6

More info: This is running in an HTTP Handler (.ashx), and I have tested it both on my local IIS 5.1, and on the hosting site which I think is IIS 6.

推荐答案

有没有任何机会的页面需要身份验证？运行时会强制缓存控制：私人需要身份验证，以prevent的私人内容被意外缓存上的公共代理页

Does the page by any chance require authentication? The runtime will force Cache-Control: private on pages that require authentication to prevent the accidental caching of private content on public proxies.

您使用卡西尼？如果是这样，它总是迫使缓存控制：私人。如果是这样，你可以尝试切换到IIS来代替。

Are you using Cassini? If so, it always forces Cache-Control: private. If so, you might try switching to IIS instead.

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