我有一个 IP 列表,这些 IP 不断抓取我们的实时站点,当它们使用不带参数的某些 URL(由于 MVC 路由)时,它们会抛出异常。我想阻止这些 IP 地址,并在它们被获取后立即返回 404 未找到页面,但我不想在 IIS 中执行此操作,因为我想记录应用程序中的遇到情况。
我编写了一个包罗万象的路由处理程序,它使用自定义 MvcHandler 来检查列表并修改响应:
public class ApplicationRouteHandler : IRouteHandler
{
public IHttpHandler GetHttpHandler(RequestContext requestContext)
{
BlacklistedIPAddressHandler handler = new BlacklistedIPAddressHandler(Cache.WebsiteCache.GetBlacklistedIPList(), requestContext);
return handler;
}
}
public class BlacklistedIPAddressHandler : MvcHandler
{
List<IPBlacklistModel> blacklist;
public BlacklistedIPAddressHandler(List<IPBlacklistModel> Blacklist, RequestContext requestContext) : base(requestContext)
{
blacklist = Blacklist;
}
protected override IAsyncResult BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, object state)
{
var ip = httpContext.Request.UserHostAddress;
if (blacklist != null &&
blacklist.Where(x => x.IP_ADDRESS.Contains(ip)).Count() > 0)
{
httpContext.Response.ClearHeaders();
httpContext.Response.Clear();
httpContext.Response.StatusCode = 404;
httpContext.Response.SuppressContent = true;
httpContext.Response.End();
}
return base.BeginProcessRequest(httpContext, callback, state);
}
}
然后实现如下:
public static void RegisterRoutes(RouteCollection routes)
{
routes.MapRoute(
"Default",
"{controller}/{action}/{id}",
new { controller = "Home", action = "Index", id = UrlParameter.Optional },
new { controller = @"[^\.]*" }
).RouteHandler = new Helpers.Routing.ApplicationRouteHandler();
}
当我执行此操作时,我不断收到“服务器无法在发送 HTTP header 后附加 header ”错误。有人可能知道为什么吗?
最佳答案
我想您应该从处理程序中删除 httpContext.Response.End();
语句 - 由于请求已传递以进行进一步处理,因此现在不应终止它。
HttpResponse.End
方法描述:
Sends all currently buffered output to the client, stops execution of the page, and raises the EndRequest event.
关于c# - 从 MVC 路由处理程序返回 404,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13821517/