Question

我有一个由Xamarin Studio开发的iOS应用程序。当我尝试从服务器获取字符串时，我得到以下异常。

Exception in Class: WebClient 
Line : 271 
and Method:DownloadDataCore 
with message Error: SendFailure (Error writing headers) 
 Stack Trace:  at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x00065] in ///Library/Frameworks/Xamarin.iOS.framework/Versions/8.2.0.207/src/mono/mcs/class/System/System.Net/HttpWebRequest.cs:971 
  at System.Net.HttpWebRequest.GetResponse () [0x0000e] in ///Library/Frameworks/Xamarin.iOS.framework/Versions/8.2.0.207/src/mono/mcs/class/System/System.Net/HttpWebRequest.cs:985 
  at System.Net.WebClient.GetWebResponse (System.Net.WebRequest request) [0x00000] in ///Library/Frameworks/Xamarin.iOS.framework/Versions/8.2.0.207/src/mono/mcs/class/System/System.Net/WebClient.cs:1563 
  at System.Net.WebClient.ReadAll (System.Net.WebRequest request, System.Object userToken) [0x00000] in ///Library/Frameworks/Xamarin.iOS.framework/Versions/8.2.0.207/src/mono/mcs/class/System/System.Net/WebClient.cs:972 
  at System.Net.WebClient.DownloadDataCore (System.Uri address, System.Object userToken) [0x0000a] in ///Library/Frameworks/Xamarin.iOS.framework/Versions/8.2.0.207/src/mono/mcs/class/System/System.Net/WebClient.cs:271

当我尝试从非SSL网站下载字符串时，可以正常加载字符串。

网站证书完全有效，Safari在模拟器和OSX中都不会拒绝。

我在模拟器上运行应用程序。

如果你能帮助我解决问题，我将非常感激。

我用来从服务器获取字符串的代码是：

System.Net.ServicePointManager.ServerCertificateValidationCallback += (o, certificate, chain, errors) => true;
WebClient wc = new WebClient ();
wc.CachePolicy = new System.Net.Cache.RequestCachePolicy (System.Net.Cache.RequestCacheLevel.NoCacheNoStore );
result =  wc.DownloadString (Url);

此致

Answer 1

在使用mono访问SSL站点之前，您必须运行mozroots --import --sync以导入mozilla可信证书列表。

此外，还有mono security FAQ可以帮助解决SSL问题。

Xamarin - 尝试从SSL网站下载String时出错（WebClient）

1 个答案: