为什么增加一个换行符状态说明在ASP.Net关闭连接？ [英] Why does adding a newline to StatusDescription in ASP.Net close the connection?

问题描述

当我返回一个状态说明与使用的HTTPStatus codeResult从ASP.Net MVC 3.0换行，我的客户端的连接被强制关闭。应用程序托管在IIS 7.0中。

例如控制器：

 公共类FooController的：控制器
 {
    公众的ActionResult MyAction（）
    {
       返回新的HTTPStatus codeResult（（INT）的HTTPStatus code.BadRequest，富\\ n吧）;
    }
 }
 

例如客户端：

 使用（Web客户端的客户端=新的WebClient（））
{
   client.DownloadString（HTTP：//本地主机/应用/美孚/ MyAction）;
}
 

引发的异常：

  System.Net.WebException：基础连接已关闭：接收时发生意外错误。
  System.IO.IOException：无法读取从传输连接数据：一个现有的连接被强行关闭远程主机。
    System.Net.Sockets.SocketException：一个现有的连接被强行关闭远程主机
 

行为使用curl时是一致的（卷曲7.25.0（I386-PC-win32）中的libcurl / 7.25.0的zlib / 1.2.6）

  

卷曲的http：//本地主机/应用/美孚/ MyAction

卷曲：（56）recv的失败：连接被重置

修改

最后我用这个自定义的ActionResult，以获得理想的效果。

 公共类BadRequestResult：的ActionResult
{
   私人const int的错误请求code =（INT）的HTTPStatus code.BadRequest;
   私人诠释计数= 0;   公共BadRequestResult（字符串错误）
      ：这（错误，）
   {
   }   公共BadRequestResult（字符串格式，params对象[]参数）
   {
      如果（String.IsNullOrEmpty（格式））
      {
         抛出新的ArgumentException（格式）;
      }      错误=的String.Format（格式参数）;      数= Errors.Split（新的String [] {} Environment.NewLine，StringSplitOptions.RemoveEmptyEntries）。长度;
   }   公共字符串错误{搞定;私人集; }   公共覆盖无效的ExecuteReuslt（ControllerContext上下文）
   {
      如果（上下文== NULL）
      {
         抛出新的ArgumentNullException（上下文）;
      }      HTT presponseBase响应= context.HttpContext.Response;
      response.TrySkipIisCustomErrors = TRUE;
      response.Status code =错误请求code;
      response.StatusDescription =的String.Format（错误的请求{0}错误（S），计数）;
      RESPONSE.WRITE（错误）;
      到Response.End（）;
   }
}
 

解决方案

您不能在HTTP头中间的断行。

HTTP协议指定报头的末尾是一个换行符。

由于线路中断是在头的中间，头部是不是一个有效的标题和你收到此错误。

修正：不要把换行符在HTTP标头的中间

When I return a StatusDescription with a newline using the HttpStatusCodeResult from ASP.Net MVC 3.0, the connection to my client is forcibly closed. App is hosted in IIS 7.0.

Example controller:

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

Example client:

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

Thrown Exception:

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

The behavior is consistent when using curl (curl 7.25.0 (i386-pc-win32) libcurl/7.25.0 zlib/1.2.6)

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

curl: (56) Recv failure: Connection was reset

Edit

I ended up using this custom ActionResult to get the desired results.

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();
   }
}

解决方案

You can't have a linebreak in the middle of an HTTP header.

The HTTP protocol specifies the end of a header is a line break.

Since the line break is in the middle of a header, the header is not a valid header and you are getting this error.

Fix: Don't put a line break in the middle of an HTTP header.

这篇关于为什么增加一个换行符状态说明在ASP.Net关闭连接？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！