AppHost crashes with HTTP/2 exception.

[mitchdenny]

Saw this when helping debug an issue with another `softie

info: Aspire.Hosting.Devcontainers.DevcontainerSettingsWriter[0]
      Port forwarding (spaces-http): http://localhost:13000
fail: Aspire.Hosting.Dashboard.Model.DashboardClient[0]
      Error #1 watching resources.
      Grpc.Core.RpcException: Status(StatusCode="Internal", Detail="Error reading next message. HttpProtocolException: The HTTP/2 server didn't respond to a ping request within the configured KeepAlivePingDelay. (HttpProtocolError)", DebugException="System.Net.Http.HttpProtocolException: The HTTP/2 server didn't respond to a ping request within the configured KeepAlivePingDelay. (HttpProtocolError)")
       ---> System.Net.Http.HttpProtocolException: The HTTP/2 server didn't respond to a ping request within the configured KeepAlivePingDelay. (HttpProtocolError)
         at System.Net.Http.Http2Connection.ThrowRequestAborted(Exception innerException)
         at System.Net.Http.Http2Connection.Http2Stream.TryReadFromBuffer(Span`1 buffer, Boolean partOfSyncRead)
         at System.Net.Http.Http2Connection.Http2Stream.ReadDataAsync(Memory`1 buffer, HttpResponseMessage responseMessage, CancellationToken cancellationToken)
         at Grpc.Net.Client.Internal.StreamExtensions.ReadMessageAsync[TResponse](Stream responseStream, GrpcCall call, Func`2 deserializer, String grpcEncoding, Boolean singleMessage, CancellationToken cancellationToken)
         at Grpc.Net.Client.Internal.GrpcCall`2.ReadMessageAsync(Stream responseStream, String grpcEncoding, Boolean singleMessage, CancellationToken cancellationToken)
         at Grpc.Net.Client.Internal.HttpContentClientStreamReader`2.MoveNextCore(CancellationToken cancellationToken)
         --- End of inner exception stack trace ---
         at Grpc.Net.Client.Internal.HttpContentClientStreamReader`2.MoveNextCore(CancellationToken cancellationToken)
         at Grpc.Net.Client.Internal.Retry.RetryCallBaseClientStreamReader`2.MoveNext(CancellationToken cancellationToken)
         at Grpc.Core.AsyncStreamReaderExtensions.ReadAllAsyncCore[T](IAsyncStreamReader`1 streamReader, CancellationToken cancellationToken)+MoveNext()
         at Grpc.Core.AsyncStreamReaderExtensions.ReadAllAsyncCore[T](IAsyncStreamReader`1 streamReader, CancellationToken cancellationToken)+System.Threading.Tasks.Sources.IValueTaskSource<System.Boolean>.GetResult()
         at Aspire.Dashboard.Model.DashboardClient.<>c__DisplayClass30_1.<<EnsureInitialized>g__WatchResourcesAsync|5>d.MoveNext() in /_/src/Aspire.Dashboard/ResourceService/DashboardClient.cs:line 325
      --- End of stack trace from previous location ---
         at Aspire.Dashboard.Model.DashboardClient.<>c__DisplayClass30_1.<<EnsureInitialized>g__WatchResourcesAsync|5>d.MoveNext() in /_/src/Aspire.Dashboard/ResourceService/DashboardClient.cs:line 325
      --- End of stack trace from previous location ---
         at Aspire.Dashboard.Model.DashboardClient.<>c__DisplayClass30_0.<<EnsureInitialized>g__WatchResourcesWithRecoveryAsync|3>d.MoveNext() in /_/src/Aspire.Dashboard/ResourceService/DashboardClient.cs:line 300
f

The AppHost stopped after this.

[mitchdenny]

@JamesNK seen anything like this before?

[JamesNK]

Why does the app host stop? The error looks like it is in the dashboard.

My guess for why you see the error is you have a break point set so the app host isn't responding to the clients pings. The dashboard retries so if this only happens once then the dashboard probably recovers.

[JamesNK]

Ping. Can you provide more information?