Question

有时我的IIS服务器开始响应304 HTTP状态到非条件请求。我还没有准确确定何时发生这种情况，但是当它启动时，所有浏览器都会继续获得304。

这是请求（使用fiddler调试）：

GET http://www.example.com/aaa/bbb/GetStaticResult HTTP/1.1
Host: www.example.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0
Accept: */*
Accept-Language: es-ES,es;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://localhost:12345/xxx
Origin: http://localhost:12345
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache

回复：

HTTP/1.1 304 Not Modified
Cache-Control: public
Expires: Thu, 30 Apr 2015 09:23:22 GMT
Last-Modified: Wed, 30 Apr 2014 09:23:22 GMT
Server: Microsoft-IIS/7.5
X-Powered-By: ASP.NET
Date: Wed, 30 Apr 2014 10:33:58 GMT

ASP.NET MVC方法如下：

[HttpGet]
[OutputCache(Duration = int.MaxValue, VaryByParam = "")]
public string GetStaticResult()
{
    return "static";
}

请求没有任何If-Modified-Since（或类似）标头。服务器不应该发出200响应吗？

可能与Getting a 304 if there is no If-Modified-Since sent?

有关

IIS以304条件状态响应非条件请求

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