題
我正在使用HtmlAgilityPack從網址中獲取文本，該文本適用於大多數網站，對於某些網站來說，它今天開始返回錯誤。
錯誤是以下行代碼doc = webGet.Load(url);錯誤消息： The underlying connection was closed: An unexpected error occurred on a send.
不知道為什麼我得到這個錯誤，因為它正在使用此網站url以前的示例url： link
我試過像bbc.com這樣的https url，它適用於它。任何指針，如果他們的代碼有問題
HtmlDocument doc = new HtmlDocument();
var url = txtGrabNewsURL.Text.Trim();
var webGet = new HtmlWeb();
doc = webGet.Load(url);
var baseUrl = new Uri(url);
// doc.LoadHtml(response);
String title = (from x in doc.DocumentNode.Descendants()
where x.Name.ToLower() == "title"
select x.InnerText).FirstOrDefault();
String desc = (from x in doc.DocumentNode.Descendants()
where x.Name.ToLower() == "meta"
&& x.Attributes["name"] != null
&& x.Attributes["name"].Value.ToLower() == "description"
select x.Attributes["content"].Value).FirstOrDefault();
String ogImage = (from x in doc.DocumentNode.Descendants()
where x.Name.ToLower() == "meta"
&& x.Attributes["property"] != null
&& x.Attributes["property"].Value.ToLower() == "og:image"
select x.Attributes["content"].Value).FirstOrDefault();
List<String> imgs = (from x in doc.DocumentNode.Descendants()
where x.Name.ToLower() == "img"
&& x.Attributes["src"] != null
select x.Attributes["src"].Value).ToList<String>();
List<String> imgList = (from x in doc.DocumentNode.Descendants("img")
where x.Attributes["src"] != null
select x.Attributes["src"].Value.ToLower()).ToList<String>();
完整錯誤詳情
System.Net.WebException was caught
HResult=-2146233079
Message=The underlying connection was closed: An unexpected error occurred on a send.
Source=System
StackTrace:
at System.Net.HttpWebRequest.GetResponse()
at HtmlAgilityPack.HtmlWeb.Get(Uri uri, String method, String path, HtmlDocument doc, IWebProxy proxy, ICredentials creds) in D:\Source\htmlagilitypack.new\Trunk\HtmlAgilityPack\HtmlWeb.cs:line 1355
at HtmlAgilityPack.HtmlWeb.LoadUrl(Uri uri, String method, WebProxy proxy, NetworkCredential creds) in D:\Source\htmlagilitypack.new\Trunk\HtmlAgilityPack\HtmlWeb.cs:line 1479
at HtmlAgilityPack.HtmlWeb.Load(String url, String method) in D:\Source\htmlagilitypack.new\Trunk\HtmlAgilityPack\HtmlWeb.cs:line 1106
at HtmlAgilityPack.HtmlWeb.Load(String url) in D:\Source\htmlagilitypack.new\Trunk\HtmlAgilityPack\HtmlWeb.cs:line 1061
at _admin_News.btnGrabNews_Click(Object sender, EventArgs e) in c:\path\News.aspx.cs:line 361
InnerException: System.IO.IOException
HResult=-2146232800
Message=Authentication failed because the remote party has closed the transport stream.
Source=System
StackTrace:
at System.Net.Security.SslState.StartReadFrame(Byte[] buffer, Int32 readBytes, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartReceiveBlob(Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken message, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.StartSendBlob(Byte[] incoming, Int32 count, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst, Byte[] buffer, AsyncProtocolRequest asyncRequest)
at System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)
at System.Net.TlsStream.CallProcessAuthentication(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Net.TlsStream.ProcessAuthentication(LazyAsyncResult result)
at System.Net.TlsStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.PooledStream.Write(Byte[] buffer, Int32 offset, Int32 size)
at System.Net.ConnectStream.WriteHeaders(Boolean async)
InnerException:
一般承認的答案
如果它只發生在HTTP S資源上，那麼你的目標是.Net 4，那麼它可能與默認的SSL / TLS支持有關。請嘗試以下方法：
using System.Net;
static void Main()
{
//place this anywhere in your code prior to invoking the Web request
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12 | SecurityProtocolType.Ssl3;
}
熱門答案
我在我的本地機器上運行代碼，它工作正常，輸出沒有任何錯誤。我以為時間網站不工作，發生了連接問題。
HtmlDocument doc = new HtmlDocument();
var url = "https://m.gulfnews.com/business/sectors/banking/rebuilding-lives-10-years-after-lehman-s-fall-1.2277318"
var webGet = new HtmlWeb();
doc = webGet.Load(url);
String title = (from x in doc.DocumentNode.Descendants()
where x.Name.ToLower() == "title"
select x.InnerText).FirstOrDefault();
產出：重建生命，10。 。 。 。 。等等。