OutputCache.VaryByHeader 未在响应中生成 Vary 标头

发布于 2024-12-07 01:27:27 字数 2037 浏览 5 评论 0原文

我有这个操作方法：

    [OutputCache(Duration = 2, 
                 Location = OutputCacheLocation.Any, 
                 VaryByHeader = "Accept-Charset")]
    public ActionResult Index()
    {
        return View();
    }

生成的响应是：

Cache-Control:public, max-age=2
Content-Length:5164
Content-Type:text/html; charset=utf-8
Date:Wed, 28 Sep 2011 16:30:33 GMT
Expires:Wed, 28 Sep 2011 16:30:35 GMT
Last-Modified:Wed, 28 Sep 2011 16:30:33 GMT
Server:Microsoft-IIS/7.5
Vary:*
X-AspNet-Version:4.0.30319
X-AspNetMvc-Version:3.0
X-Powered-By:ASP.NET

为什么 Vary 标头显示星号而不是 Accept-Charset ？

OutputCacheAttribute 确实对响应有影响，实际上，Expires 和 Cache-Control:max-age=n 标头取决于 Duration 参数，以及 Cache-Control:public/private/no-cache 取决于 Location代码> 参数。

我为 OutputCacheAttribute 创建了一个包装器，以查看发生了什么：

public class CustomOutputCacheAttribute:OutputCacheAttribute
{
    public override void OnResultExecuted(ResultExecutedContext filterContext)
    {
        base.OnResultExecuted(filterContext);

        Dictionary<String, String> headers = new Dictionary<string, string>();
        foreach (var header in filterContext.HttpContext.Response.Headers.AllKeys)
            headers.Add(header, filterContext.HttpContext.Response.Headers[header]);

        Debugger.Break();
    }
}

标头未在中断中显示，因此 OutputCacheAttribute 所做的可能是配置 HttpContext.Current .Response.Cache。

我可以看到 filterContext.HttpContext.Response.Cache.VaryByHeaders.UserCharSet 是如何 true 的，例如 filterContext.HttpContext.Response.Cache.VaryByHeaders.AcceptTypes< /code> 为 false，但 Vary 标头始终显示 *。

我想知道唯一可能的值是否是作为 filterContext.HttpContext.Response.Cache.VaryByHeaders 属性列出的四个值，可能是吗？

干杯。

原文

I have this action method:

    [OutputCache(Duration = 2, 
                 Location = OutputCacheLocation.Any, 
                 VaryByHeader = "Accept-Charset")]
    public ActionResult Index()
    {
        return View();
    }

And the generated response is:

Cache-Control:public, max-age=2
Content-Length:5164
Content-Type:text/html; charset=utf-8
Date:Wed, 28 Sep 2011 16:30:33 GMT
Expires:Wed, 28 Sep 2011 16:30:35 GMT
Last-Modified:Wed, 28 Sep 2011 16:30:33 GMT
Server:Microsoft-IIS/7.5
Vary:*
X-AspNet-Version:4.0.30319
X-AspNetMvc-Version:3.0
X-Powered-By:ASP.NET

Why is the Vary header showing an asterisk instead of Accept-Charset ?

OutputCacheAttribute does have effect on the response, actually, the Expires and Cache-Control:max-age=n headers depends on the Duration argument, and the Cache-Control:public/private/no-cache depends on the Location argument.

I have created a wrapper for OutputCacheAttribute to see what is going on:

public class CustomOutputCacheAttribute:OutputCacheAttribute
{
    public override void OnResultExecuted(ResultExecutedContext filterContext)
    {
        base.OnResultExecuted(filterContext);

        Dictionary<String, String> headers = new Dictionary<string, string>();
        foreach (var header in filterContext.HttpContext.Response.Headers.AllKeys)
            headers.Add(header, filterContext.HttpContext.Response.Headers[header]);

        Debugger.Break();
    }
}

The headers are not shown in the break, so probably what OutputCacheAttribute does is configure HttpContext.Current.Response.Cache.

I can see how filterContext.HttpContext.Response.Cache.VaryByHeaders.UserCharSet is true, and for example filterContext.HttpContext.Response.Cache.VaryByHeaders.AcceptTypes is false, but the Vary header always says *.

I am wondering if the only possible values are the four ones listed as properties of filterContext.HttpContext.Response.Cache.VaryByHeaders, could it be?

Cheers.

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清泪尽 2024-12-14 01:27:27

解决方案是使用 Response.Cache.SetOmitVaryStar (true)

    [OutputCache(Duration = 2,
         Location = OutputCacheLocation.Any,
         VaryByHeader = "Accept-Charset")]
    public ActionResult Index()
    {
        Response.Cache.SetOmitVaryStar(true);
        return View("ShowHeaders");
    }

我仍在尝试找出该线程中 Vary:* 出了什么问题：HTTP 标头 Vary 的含义是什么：*

The solution is use Response.Cache.SetOmitVaryStar(true)

    [OutputCache(Duration = 2,
         Location = OutputCacheLocation.Any,
         VaryByHeader = "Accept-Charset")]
    public ActionResult Index()
    {
        Response.Cache.SetOmitVaryStar(true);
        return View("ShowHeaders");
    }

I am still trying to figure out what is wrong with Vary:* in this thread: What is the meaning of the HTTP header Vary:*

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