Question

当我使用ASP.Net MVC 3.0中的HttpStatusCodeResult返回带有换行符的StatusDescription时，强制关闭与客户端的连接。应用程序托管在IIS 7.0中。

控制器示例：

 public class FooController : Controller
 {
    public ActionResult MyAction()
    {
       return new HttpStatusCodeResult((int)HttpStatusCode.BadRequest, "Foo \n Bar");
    }
 }

客户端示例：

using (WebClient client = new WebClient())
{
   client.DownloadString("http://localhost/app/Foo/MyAction");
}

抛出异常：

System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. 
  System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.
    System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host

使用curl时的行为是一致的（curl 7.25.0（i386-pc-win32）libcurl / 7.25.0 zlib / 1.2.6）

curl http://localhost/app/Foo/MyAction

卷曲：（56）Recv失败：重置连接

修改

我最终使用这个自定义ActionResult来获得所需的结果。

public class BadRequestResult : ActionResult
{
   private const int BadRequestCode = (int)HttpStatusCode.BadRequest;
   private int count = 0;

   public BadRequestResult(string errors)
      : this(errors, "")
   {
   }

   public BadRequestResult(string format, params object[] args)
   {
      if (String.IsNullOrEmpty(format))
      {
         throw new ArgumentException("format");
      }

      Errors = String.Format(format, args);

      count = Errors.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries).Length;
   }

   public string Errors { get; private set; }

   public override void ExecuteResult(ControllerContext context)
   {
      if (context == null)
      {
         throw new ArgumentNullException("context");
      }

      HttpResponseBase response = context.HttpContext.Response;
      response.TrySkipIisCustomErrors = true;
      response.StatusCode = BadRequestCode;
      response.StatusDescription = String.Format("Bad Request {0} Error(s)", count);
      response.Write(Errors);
      response.End();
   }
}

Answer 1

您不能在HTTP标头的中间使用换行符。

HTTP协议指定标题的结尾是换行符。

由于换行符位于标题的中间，因此标题不是有效的标题，并且您收到此错误。

修复：不要在HTTP标头的中间放置换行符。

为什么在ASP.Net中向StatusDescription添加换行符会关闭连接？

1 个答案: