c# – 在.Net Core中将Nexmo连接到Websocket失败(远程方关闭了WebSocket)

概述我正在尝试在进行呼入时将Nexmo连接到Web套接字(用户使用nexmo调用已购买的号码并链接到应用程序). 截至目前,我只是尝试这个Sample Code(简单地回复了调用者所说的内容),并按照“文档”Here通过Nexmo连接到这个websocket. 我成功地向nexmo发送了一个动作“connect”.在调用Nexmo购买的号码时,它正确地重定向到端点(api / nexmo / sock 我正在尝试在进行呼入时将Nexmo连接到Web套接字(用户使用nexmo调用已购买的号码并链接到应用程序).

截至目前,我只是尝试这个Sample Code(简单地回复了调用者所说的内容),并按照“文档”Here通过Nexmo连接到这个websocket.

我成功地向nexmo发送了一个动作“connect”.在调用Nexmo购买的号码时,它正确地重定向到端点(API / nexmo / socket),如使用断点时所示,但是当它在Echo方法中到达webSocket.ReceiveAsync时它会挂起.

using System;    using System.Net.WebSockets;    using System.Threading;    using System.Threading.Tasks;    using Microsoft.AspNetCore.http;    using Microsoft.AspNetCore.Mvc;    using Newtonsoft.Json.linq;    namespace MyProject.Web.Controllers    {        [Route("API/[controller]")]        [APIController]        public class NexmoController : ControllerBase        {            private WebSocket _webSocket;            [httpGet("answer")]            public IActionResult AnswerHandler()            {                const string host = "MY_NGROK_URL";                const string locale = "fr-FR";                var nccos = new JArray();                var nccoConnect = new JObject()                {                    { "action","connect" },{ "endpoint",new JArray(new JObject{                            { "type","websocket" },{ "uri",$"wss://{host}/API/nexmo/socket"},{ "content-type","audio/l16;rate=16000"},{ "headers",new JObject {                                    { "language",locale },{ "callerID","MY_NUMBER_HARDCODED_WHILE_TESTING" }                                }                            }                        })                    }                };                nccos.Add(nccoConnect);                return Content(nccos.ToString(),"application/Json");            }            [httpPost("event")]            public IActionResult EventHandler()            {                return Ok();            }            [httpGet("socket")]            public async Task GetAudio()            {                if (httpContext.WebSockets.IsWebSocketRequest)                {                    _webSocket = await httpContext.WebSockets.AcceptWebSocketAsync();                    await Echo(httpContext,_webSocket);                }                else                {                    httpContext.Response.StatusCode = 400;                }            }            //copy Paste from the Sample Code            private async Task Echo(httpContext context,WebSocket webSocket)            {                var buffer = new byte[1024 * 4];                //Breakpoint : ReceiveAsync generates an exception                WebSocketReceiveResult result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer),CancellationToken.None);                while (!result.CloseStatus.HasValue)                {                    await webSocket.SendAsync(new ArraySegment<byte>(buffer,result.Count),result.MessageType,result.EndOfMessage,CancellationToken.None);                    result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer),CancellationToken.None);                }                await webSocket.CloseAsync(result.CloseStatus.Value,result.CloseStatusDescription,CancellationToken.None);            }        }    }

这里捕到的异常：

System.Net.WebSockets.WebSocketException (0x80004005): The remote
party closed the WebSocket connection without completing the close
handshake. —> System.Net.WebSockets.WebSocketException (0x80004005):
The remote party closed the WebSocket connection without completing
the close handshake.

更多例外：

at System.Net.WebSockets.ManageDWebSocket.ThrowIfEOFUnexpected(Boolean
throwOnPrematureClosure)
at System.Net.WebSockets.ManageDWebSocket.EnsureBufferContainsAsync(Int32
minimumrequiredBytes,CancellationToken cancellationToken,Boolean
throwOnPrematureClosure)
at System.Net.WebSockets.ManageDWebSocket.ReceiveAsyncPrivate[TWebSocketReceiveResultGetter,TWebSocketReceiveResult](Memory`1
payloadBuffer,
TWebSocketReceiveResultGetter resultGetter) at
System.Net.WebSockets.ManageDWebSocket.ReceiveAsyncPrivate[TWebSocketReceiveResultGetter,
TWebSocketReceiveResultGetter resultGetter) at
….Controllers.NexmoController.Echo(httpContext context,
WebSocket webSocket) in
C:…\Controllers\NexmoController.cs:line
97 at ….Controllers.NexmoController.GetAudio() in
C:…\Controllers\NexmoController.cs:line
68 at lambda_method(Closure,Object ) at
Microsoft.Extensions.Internal.ObjectMethodExecutorAwaitable.Awaiter.GetResult()
at
Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.AwaitableResultExecutor.Execute(IActionResultTypeMapper
mapper,ObjectMethodExecutor executor,Object controller,Object[]
arguments) at System.Threading.Tasks.ValueTask`1.get_Result() at
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync()
at
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterasync()
at
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext
context) at
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State&
next,Scope& scope,Object& state,Boolean& isCompleted) at
Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterasync()
at
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
at
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext
context) at
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next,
Scope& scope,Boolean& isCompleted) at
Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
at Microsoft.AspNetCore.Routing.EndpointMIDdleware.Invoke(httpContext
httpContext) at
Microsoft.AspNetCore.Routing.EndpointRoutingMIDdleware.Invoke(httpContext
httpContext) at
Microsoft.AspNetCore.Staticfiles.StaticfileMIDdleware.Invoke(httpContext
context) at
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMIDdleware.Invoke(httpContext
context)

什么想法发生了什么？或者我如何解决这个问题？
我真的不明白这里的问题是什么.

我还尝试检查Websocket的WebSocketState,并将其设置为“Open”.
有关信息,我自己测试了示例代码(websocket回应用户的输入)并且它可以工作.

解决方法 我们找到了一个解决方案：

> ngrock不支持websockets(不是免费),所以我们在azure上发布了我们的应用程序.
>我们需要实例化websocket
StartUp而不是我们的控制器(如sample code
listed in the original post).我们已经采用了“Echo”方法
另一个类(更多是为了保持良好的结构)并设置它
静态的.

现在一切正常:)

澄清：ngrock不适用于安全的websockets(wss)

总结

以上是内存溢出为你收集整理的c# – 在.Net Core中将Nexmo连接到Websocket失败(远程方关闭了WebSocket)全部内容，希望文章能够帮你解决c# – 在.Net Core中将Nexmo连接到Websocket失败(远程方关闭了WebSocket)所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。