部署到IIS 7.5后，自定义404页为空白

Question

不正确的url，如http://localhost:54321/foo/bar并且像CCD_ 1这样的错误在我的本地主机中处理得很好。在部署到IIS 7.5之后，它在上述两种情况下都会返回一个空白页面。我在这里看到过其他人有这个问题（这是莫尔德的评论，获得了几张赞成票）。代码：

Web.Config

<system.web>
  <customErrors mode="Off" redirectMode="ResponseRedirect">
    <error statusCode="404" redirect="~/Error/NotFound"/>
  </customErrors>
</system.web>
<httpErrors errorMode="Custom" existingResponse="Replace">
  <remove statusCode="404" />
  <error statusCode="404" responseMode="ExecuteURL" path="/Error/NotFound"/>
  <remove statusCode="500" />
  <error statusCode="500" responseMode="ExecuteURL" path="/Error/Error"/>
</httpErrors>

错误控制器

public class ErrorController : Controller
{
    public ActionResult NotFound() {
        Response.StatusCode = 404;
        Response.TrySkipIisCustomErrors = true;
        return View();
    }
}

RouteConfig

 routes.MapRoute(
            "Error - 404",
            "NotFound",
            new { controller = "Error", action = "NotFound" }
            );
        routes.MapRoute(
            "Error - 500",
            "Error",
            new { controller = "Error", action = "Error" }
            );
        routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );

未找到

<h2>404 Not Found</h2>
<div class="alert alert-info">
    <p><strong>Whoops...</strong></p>
    <p>The resource you were looking for doesn't exist</p>
</div>

服务器运行Windows server 2008 R2。当我去/foo/bar或一个操作返回HttpNotFound()，则返回一个空白页。知道吗？

主页/测试

public class HomeController: Controller{
    // ...
    public ActionResult Test(){
        return HttpNotFound();
    }
}

更新：当我转到服务器上的/Error/NotFound时，它也会返回一个带有404的空白页。Fiddler的回应：

HTTP/1.1 404 Not Found
Cache-Control: private
Content-Type: text/html; charset=utf-8
Server: Microsoft-IIS/7.5 
X-AspNetMvc-Version: 5.2
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?  QzpccWhlXFByb2plY3RzXFZlbmRvclBvcnRhbFxWZW5kb3JQb3J0YWxcRXJyb3JcTm90Rm91bmQ=?=
X-Powered-By: ASP.NET
Date: Thu, 23 Apr 2015 13:24:49 GMT
Content-Length: 5434

更新2:如果我拿走existingResponse="Replace"，我可以在服务器上打开Error/NotFound。但在MyServer/MyProject/foo/bar 上仍有空白页

Answer 1

在我的案例中，原因是IIS-web设置-请求筛选-SQL注入筛选器。。。

如果url或查询字符串包含;，则响应以状态404.19结束-筛选规则拒绝。然后显示空白页。IIS重定向到自定义错误，如下所示http://server.com/Error404.aspx?404；http://server.com/missingURL而字符;就是请求过滤器因为SQL注入而终止请求的原因。