当WebClient下载字符串时，底层连接异常关闭

Question

只是一段代码

WebClient wc = new WebClient();
String str = wc.DownloadString(new Uri("http://content.warframe.com/dynamic/rss.php"));

我得到exception:

System.Net类型的未处理异常。webeexception '发生在System.dll

附加信息:底层连接已关闭连接被意外关闭。

我知道这是。net中的一个bug(我使用的是3.5)，但是我尝试了其他方法来获取这个链接的内容(它的rss, xml)。还没有运气

var webrequest = (WebRequest)HttpWebRequest.Create(@"http://content.warframe.com/dynamic/rss.php");
var resp = webrequest.GetResponse();
//HttpWebResponse webresponse = (HttpWebResponse)webrequest.GetResponse(); // Wont work also

上面的代码也不能工作，两者都强制转换相同的异常

提琴手日志:

会话状态:Aborted.
响应实体大小:512字节

== FLAGS ==================
BitFlags: [ResponseGeneratedByFiddler] 0x100
X-ABORTED-WHEN:做
X-CLIENTIP: 127.0.0.1
X-CLIENTPORT: 2747
X-EGRESSPORT: 2748
X-FAILSESSION-WHEN: ReadingResponse
X-HOSTIP: 205.185.216.10
X-PROCESSINFO: willitwork.vshost: 3300

== TIMING INFO ============
ClientConnected: 10:29:11.706
ClientBeginRequest: 10:29:11.713
GotRequestHeaders: 10:29:11.713
ClientDoneRequest: 10:29:11.713
确定网关:0ms
DNS查找:164ms
TCP/IP连接:74ms
HTTPS握手:0ms
ServerConnected: 10:29:11.953
FiddlerBeginRequest: 10:29:11.953
ServerGotRequest: 10:29:11.953
ServerBeginResponse: 10:29:12.372
GotResponseHeaders: 00:00:00.000
ServerDoneResponse: 10:29:12.372
ClientBeginResponse: 10:29:12.385
ClientDoneResponse: 10:29:12.385

总用时:0:00:00.672

== WININET CACHE INFO ============
此URL不存在于WinINET缓存中。(代码:2]
*注意:上面的数据显示的是WinINET当前的缓存状态，而不是请求时的状态。*注:以上数据仅显示WinINET的介质完整性(非保护模式)缓存。

也- 504，这是没有意义的，因为我可以从链接通过chrome/firefox/ie…

我只是为了在其他语言中工作而这样做，但我被迫用c#来做(我写了2个代码来重写它)

我添加了一些设置，比如fiddler said

myHttpWebRequest1.ProtocolVersion = HttpVersion.Version11;
myHttpWebRequest1.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36";
myHttpWebRequest1.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";

至少现在我得到504错误而不是"未知"，但我仍然可以通过web浏览器查看内容，所以504错误是假

编辑:当我添加 时没有响应错误

myHttpWebRequest1.Headers["Accept-Encoding"] = "gzip";

但现在输出是混乱的，不可读

Answer 1

我也有同样的错误。

你可以添加用户代理到你的httpRequest

request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";

Answer 2

好的，我得到了这一切修复&工作!

static void Main(string[] args)
{
    Uri url = new Uri(@"http://content.warframe.com/dynamic/rss.php");
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
    // MAGIC LINE GOES HERE /
    request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
    // Assign the response object of HttpWebRequest to a HttpWebResponse variable.
    using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
    {
        using (Stream streamResponse = response.GetResponseStream())
        {
            using (StreamReader streamRead = new StreamReader(streamResponse))
            {
                Char[] readBuff = new Char[2000];
                int count = streamRead.Read(readBuff, 0, 2000);
                while (count > 0)
                {
                    String outputData = new String(readBuff, 0, count);
                    Console.Write(outputData);
                    count = streamRead.Read(readBuff, 0, 2000);
                }
            }
        }
    }
    Console.ReadKey();
}

除了不使用WebClient。下载字符串方法我必须添加解压行

request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;

感谢提示(特别是小提琴手之一，解码按钮节省了我的时间来找到什么是错的)

Answer 3

检查这个答案:

. .底层连接已关闭:在接收

上发生意外错误

所以这可能对你有用:

var webRequest = (HttpWebRequest)HttpWebRequest.Create(@"http://content.warframe.com/dynamic/rss.php");
webRequest.KeepAlive = false;
var resp = webRequest.GetResponse();        

编辑:

你是对的，检查一下:http://msdn.microsoft.com/cs-cz/library/system.net.httpwebrequest.keepalive%28v=vs.110%29.aspx

下面是打印接收到的响应内容的工作代码:

    static void Main(string[] args)
    {
          // Create a new HttpWebRequest object.Make sure that 
          // a default proxy is set if you are behind a firewall.
          HttpWebRequest myHttpWebRequest1 =
            (HttpWebRequest)WebRequest.Create(@"http://content.warframe.com/dynamic/rss.php");
          myHttpWebRequest1.KeepAlive=false;
          // Assign the response object of HttpWebRequest to a HttpWebResponse variable.
          HttpWebResponse myHttpWebResponse1 = 
            (HttpWebResponse)myHttpWebRequest1.GetResponse();
          Console.WriteLine("nThe HTTP request Headers for the first request are: n{0}", myHttpWebRequest1.Headers);
          Stream streamResponse = myHttpWebResponse1.GetResponseStream();
          StreamReader streamRead = new StreamReader(streamResponse);
          Char[] readBuff = new Char[256];
          int count = streamRead.Read(readBuff, 0, 256);
          Console.WriteLine("The contents of the Html page are.......n");
          while (count > 0)
          {
              String outputData = new String(readBuff, 0, count);
              Console.Write(outputData);
              count = streamRead.Read(readBuff, 0, 256);
          }
          Console.WriteLine();
          // Close the Stream object.
          streamResponse.Close();
          streamRead.Close();
          Console.ReadKey();
    }