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我看到很多以下错误，我认为这是对操作方法的 HEAD 请求（可能来自机器人）：

A public action method 'index' was not found on controller     'MyWebsite.MyController'.
   at System.Web.Mvc.Controller.HandleUnknownAction(String actionName)
   at EPiServer.Web.Mvc.ActionControllerBase.HandleUnknownAction(String     actionName)
   at System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult     asyncResult, ExecuteCoreState innerState)
   at     System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyn    cResult asyncResult)
   at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)
   at     System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyn    cResult asyncResult)
   at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult     asyncResult, ProcessRequestState innerState)
   at     System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallEndDelegate(IAsyn    cResult asyncResult)
   at     System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.I    ExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&     completedSynchronously)

我的操作方法最初仅设置为接受 GET 请求，但我现在已将其更改为也接受 HEAD 请求，例如：

    [AcceptVerbs(HttpVerbs.Get | HttpVerbs.Head)]
    public async override Task<ActionResult> Index()
    {
      ....
      return View(new Model());
    }

但是，当我测试页面的 HEAD 请求时，我在响应中看到相同的错误和 404 状态代码。

请问有人知道是什么原因造成的吗？

更新以包括控制器继承（为简单起见删除了很多）：

我的控制器...

 public class MyController: BasicContentPageController<MyPageType>
{


    public MyController(IPageUrlProvider pageUrlProvider)
        : base(pageUrlProvider)
    {

    }

[AcceptVerbs(HttpVerbs.Get | HttpVerbs.Head)]
    public async override Task<ActionResult> Index()
    {
    ...
    return View(new Model());
    }

}

...从 BasicContentPageController 继承...

 public abstract class BasicContentPageController<T> : MyBasePageContoller<T> where T : MyBasePageType
    {

 protected BasicContentPageController(IPageUrlProvider pageUrlProvider)
        : base(pageUrlProvider)
    {

    }

 [AcceptVerbs(HttpVerbs.Get | HttpVerbs.Head)]
    public virtual async Task<ActionResult> Index()
    {
        return View(await GetBasicPageViewModel());
    }

}

...从 MyBasePageController 继承...

 public abstract class MyBasePageContoller<T> : PageController<T>
    where T : MyBasePageType
{
protected readonly IPageUrlProvider PageUrls;

 protected MyBasePageContoller(IPageUrlProvider pageUrlProvider)
    {
        PageUrls = pageUrlProvider;

    }

}
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