HttpClient 已断开连接。试图读取流的末尾

Question

我在 IIS 上有一个简单的 webApi 应用程序。有一个 MessageController 是 ControllerBase 和 [Route("api/[controller]"), ApiController]。我有唯一的方法 [HttpPost] public IActionResult Send([FromBody] MessageViewModel message) 和两个字段的模型。

然后，我有一个将消息发送到 webApi 的 ApiConnector：

public class ApiConnector : IDisposable
{
    private readonly HttpClient _client = new HttpClient();
    private readonly string _apiUrl;

    public ApiConnector(string apiUrl) => _apiUrl = apiUrl;

    public void SendMessage(string sender, string message)
    {
        try
        {
            _client.PostAsJsonAsync($"{_apiUrl}/message", new { sender, message });
        }
        catch { }
    }
}

一切都是用 Asp Core 2.2 编写的。当我运行来自 ConsoleApp 的 ApiConnector（在 while(true) 循环内）时，一切正常。当我从 Postman POST 时，一切正常。但是，一旦我尝试从任何其他地方（应用程序，我想没有无限循环）做同样的事情，WebApi 控制器就会崩溃。

消息：客户端已断开连接；内部消息：试图读取流的末尾。

如何正确发送这个请求？

异常文本：

"Message":"The client has disconnected",
"Data":{},
"InnerException":{
   "ClassName":"System.IO.EndOfStreamException",
   "Message":"Attempted to read past the end of the stream.",
   "Data":null,
   "InnerException":null,
   "HelpURL":null,
   "StackTraceString":null,
   "RemoteStackTraceString":null,
   "RemoteStackIndex":0,
   "ExceptionMethod":null,
   "HResult":-2147024858,
   "Source":null,
   "WatsonBuckets":null},
"StackTrace":"   
at Microsoft.AspNetCore.Server.IIS.Core.IO.AsyncIOOperation.GetResult(Int16 token)\r\n   
at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContext.ReadBody()\r\n   
at System.IO.Pipelines.PipeCompletion.ThrowLatchedException()\r\n   
at System.IO.Pipelines.Pipe.GetReadResult(ReadResult& result)\r\n   
at System.IO.Pipelines.Pipe.GetReadAsyncResult()\r\n   
at System.IO.Pipelines.Pipe.DefaultPipeReader.GetResult(Int16 token)\r\n   
at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContext.ReadAsync(Memory`1 memory, CancellationToken cancellationToken)\r\n   
at Microsoft.AspNetCore.Server.IIS.Core.HttpRequestStream.ReadAsyncInternal(Memory`1 buffer, CancellationToken cancellationToken)\r\n   
at Microsoft.AspNetCore.WebUtilities.FileBufferingReadStream.ReadAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)\r\n   
at Microsoft.AspNetCore.WebUtilities.StreamHelperExtensions.DrainAsync(Stream stream, ArrayPool`1 bytePool, Nullable`1 limit, CancellationToken cancellationToken)\r\n   
at Microsoft.AspNetCore.Mvc.Formatters.JsonInputFormatter.ReadRequestBodyAsync(InputFormatterContext context, Encoding encoding)\r\n   
at Microsoft.AspNetCore.Mvc.ModelBinding.Binders.BodyModelBinder.BindModelAsync(ModelBindingContext bindingContext)\r\n   
at Microsoft.AspNetCore.Mvc.ModelBinding.ParameterBinder.BindModelAsync(ActionContext actionContext, IModelBinder modelBinder, IValueProvider valueProvider, ParameterDescriptor parameter, ModelMetadata metadata, Object value)\r\n   
at Microsoft.AspNetCore.Mvc.Internal.ControllerBinderDelegateProvider.<>c__DisplayClass0_0.<<CreateBinderDelegate>g__Bind|0>d.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()\r\n   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()\r\n   
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)\r\n   
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)\r\n   
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()\r\n   
at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()\r\n   
at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)\r\n   
at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext)\r\n   
at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)\r\n   
at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync()","HelpLink":null,"Source":"Microsoft.AspNetCore.Server.IIS","HResult":-2146232800

P.S。我已经尝试 Wait() _client 的结果无济于事。

Answer 1

我用谷歌搜索更准确，发现了一个问题。这是已知问题并已修复，但当前版本中未修复。我想遇到此类问题的任何人都需要构建问题 discuss.

中提到的适当的 dll

HttpClient 已断开连接。试图读取流的末尾

HttpClient has disconnected. Attempted to read past the end of the stream

c#

dotnet-httpclient

.net-core