如何正确的为web.config编写http error code的自定义页面

<system.webServer>
<httpErrors errorMode="Custom">
<remove statusCode="404" subStatusCode="0" />
<error statusCode="404" subStatusCode="0" path="/home/http/404" responseMode="ExecuteURL" />
<remove statusCode="400"/>
<error statusCode="400" path="/home/http/400" responseMode="ExecuteURL" />
</httpErrors>
</system.webServer>

<system.web>
<customErrors mode="On" defaultRedirect="/home/http/0">
<error statusCode="404" redirect="/home/http/404" />
<error statusCode="500" redirect="/home/http/500" />
</customErrors>
</system.web>

public ActionResult Http(string id)
{
string viewName = "~/Views/Shared/http" + id + ".cshtml";
if (!System.IO.File.Exists(Server.MapPath(viewName)))
{
viewName = "~/Views/Shared/Error.cshtml";
}
return View(viewName);
}