Unexpected http3 request while using the grpc-web

[shuowpro]

We are using the grpc web on net framework because we have some problem about supporting the http2. we are expecting that while using the grpc-web, it should using the http1.1, however, we get the following exception which indicates that it try to using the http3 instead. that is something we didn't expected.

The exception:

{"Grpc.Core.RpcException":"Grpc.Core.RpcException: Status(StatusCode="Unavailable", Detail="Error starting gRPC call. HttpRequestException: The connection timed out from inactivity. (example.com:443) QuicException: The connection timed out from inactivity.", DebugException="System.Net.Http.HttpRequestException: The connection timed out from inactivity. (example.com:443)")\r\n ---> System.Net.Http.HttpRequestException: The connection timed out from inactivity. (example.com:443)\r\n ---> System.Net.Quic.QuicException: The connection timed out from inactivity.\r\n at System.Net.Quic.QuicConnection.HandleEventShutdownInitiatedByTransport(_SHUTDOWN_INITIATED_BY_TRANSPORT_e__Struct& data)\r\n at System.Net.Quic.QuicConnection.HandleConnectionEvent(QUIC_CONNECTION_EVENT& connectionEvent)\r\n at System.Net.Quic.QuicConnection.NativeCallback(QUIC_HANDLE* connection, Void* context, QUIC_CONNECTION_EVENT* connectionEvent)\r\n--- End of stack trace from previous location ---\r\n at System.Net.Quic.ValueTaskSource.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token)\r\n at System.Net.Quic.QuicConnection.FinishConnectAsync(QuicClientConnectionOptions options, CancellationToken cancellationToken)\r\n at System.Net.Quic.QuicConnection.g__StartConnectAsync|2_0(QuicClientConnectionOptions options, CancellationToken cancellationToken)\r\n at System.Net.Quic.QuicConnection.g__StartConnectAsync|2_0(QuicClientConnectionOptions options, CancellationToken cancellationToken)\r\n at System.Net.Http.ConnectHelper.ConnectQuicAsync(HttpRequestMessage request, DnsEndPoint endPoint, TimeSpan idleTimeout, SslClientAuthenticationOptions clientAuthenticationOptions, CancellationToken cancellationToken)\r\n --- End of inner exception stack trace ---\r\n at System.Net.Http.ConnectHelper.ConnectQuicAsync(HttpRequestMessage request, DnsEndPoint endPoint, TimeSpan idleTimeout, SslClientAuthenticationOptions clientAuthenticationOptions, CancellationToken cancellationToken)\r\n at System.Net.Http.HttpConnectionPool.GetHttp3ConnectionAsync(HttpRequestMessage request, HttpAuthority authority, CancellationToken cancellationToken)\r\n at System.Net.Http.HttpConnectionPool.TrySendUsingHttp3Async(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)\r\n at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)\r\n at Grpc.Net.Client.Web.GrpcWebHandler.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken)\r\n at System.Net.Http.HttpClient.g__Core|83_0(HttpRequestMessage request, HttpCompletionOption completionOption, CancellationTokenSource cts, Boolean disposeCts, CancellationTokenSource pendingRequestsCts, CancellationToken originalCancellationToken)\r\n at Grpc.Net.Client.Internal.GrpcCall2.RunCall(HttpRequestMessage request, Nullable1 timeout)\r\n --- End of inner exception stack trace ---\r\n at Grpc.Net.Client.Internal.GrpcCall`2.GetResponseHeadersCoreAsync()\r\n at Microsoft.Exchange.Hygiene.ContentExtraction.Core.ContentExtractionGrpcNetCoreClient.RetrieveContentExtractionRemoteResponseAsync(IContentExtractionLogger contentExtractionLogger, ContentExtractionRemoteRequestPayload requestPayload, Guid tenantId)"}

The code we are using:

            // the subdirectoryhandler is from https://learn.microsoft.com/en-us/aspnet/core/grpc/troubleshoot?view=aspnetcore-8.0#calling-grpc-services-hosted-in-a-sub-directory
            var handler = new GrpcWebHandler(
                new SubdirectoryHandler(
                    new HttpClientHandler(), "/app"));
            handler.HttpVersion = System.Net.HttpVersion.Version11;

            HttpClient httpClient = new HttpClient(handler);
            GrpcChannelOptions channelOptions = new GrpcChannelOptions()
            {
                HttpClient = httpClient,
                ServiceConfig = new ServiceConfig(),
            };
            var channel = GrpcChannel.ForAddress("https://example.com/", channelOptions);
            return channel;

Anyidea why it happened, how could we enforce it to using http1.1 instead of http3?

[fallenwood]

I met the same problem today, but I cannot reproduce it with local environment :(