我正在构建一个连接到Predix Timeseries实例的Web应用程序,以通过websocket接收数据。当我尝试创建套接字时,我得到了这个例外:
System.Net.WebSockets.WebSocketException:'无法连接到 远程服务器'
我正在使用此代码创建我的websocket,并在ConnectAsync调用中抛出了我的错误:
public async Task openWebSocket()
{
_socket = new ClientWebSocket();
_socket.Options.SetRequestHeader(headerName: "predix-zone-id", headerValue: PREDIX_ZONE_ID_HERE);
_socket.Options.SetRequestHeader(headerName: "authorization", headerValue: "Bearer " + AUTH_TOKEN_HERE);
_socket.Options.SetRequestHeader(headerName: "content-type", headerValue: "application/json");
CancellationToken token = new CancellationToken();
var uri = new Uri(uriString: "wss://gateway-predix-data-services.run.aws-usw02-pr.ice.predix.io/v1/stream/messages");
await _socket.ConnectAsync(uri: uri, cancellationToken: token);
}
这是我的异常堆栈跟踪:
System.Net.WebSockets.WebSocketException occurred
HResult=0x80004005
Message=Unable to connect to the remote server
Source=<Cannot evaluate the exception source>
StackTrace:
at System.Net.WebSockets.WebSocketHandle.<ConnectAsyncCore>d__20.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Net.WebSockets.ClientWebSocket.<ConnectAsyncCore>d__16.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PROJECTNAME.Services.TimeseriesService.<openWebSocket>d__6.MoveNext() in %PROJECTLOCATION%\Services\%SERVICENAME%.cs:line 34
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PROJECTNAME.Services.TimeseriesService.<Initialize>d__5.MoveNext() in %PROJECTLOCATION%\Services\%SERVICENAME%.cs:line 21
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at PROJECTNAME.Program.<Initialize>d__1.MoveNext() in %PROJECTLOCATION%\Program.cs:line 52
Inner Exception 1:
WebSocketException: Unable to connect to the remote server
内部异常堆栈跟踪只有更多信息,但注意到可能有用的ThrowOnInvalidConnectState():
at System.Net.WebSockets.WinHttpWebSocket.ThrowOnInvalidConnectState()
at System.Net.WebSockets.WinHttpWebSocket.<ConnectAsync>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Net.WebSockets.WebSocketHandle.<ConnectAsyncCore>d__20.MoveNext()
我不确定还有什么可以尝试 - 很多其他帖子在SO上至少在内部异常中有一些有用的信息。
我也尝试过使用Fiddler。我可以看到其他服务的消息,包括从UAA检索我的身份验证令牌,但此服务没有任何内容。
我在某处错过了一些配置步骤吗?任何帮助或指导将不胜感激。
答案 0 :(得分:2)
我想出了这个问题。 Predix时间序列的三个必需标题是:
我的问题是我尝试了Origin标头,但application_uris的Predix VCAP_APPLCIATION环境变量不包含“https://”。一旦我手动添加它(“https://”+ uri),它就可以正常工作。
答案 1 :(得分:0)
我在C#中没有这样做,但“无法连接”听起来像是网络问题。你能打开一个websocket到另一台服务器吗?也许这个?
https://www.websocket.org/echo.html
可能是代理服务器问题?你可以试试不同的网络吗?