[GitHub] [arrow] eerhardt edited a comment on pull request #8694: ARROW-10542: [C#][Flight] Add beginning on flight code for net core

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eerhardt edited a comment on pull request #8694:
URL: https://github.com/apache/arrow/pull/8694#issuecomment-731202315


   UPDATE: I resolved the below issue with this answer: 
https://stackoverflow.com/a/58053460/3680432
   
   @Ulimo - how much of this is expected to work end-to-end? I've been trying 
to use it against an example server I found in the repo: 
https://github.com/apache/arrow/blob/master/python/examples/flight/server.py.
   
   However, I am not able to successfully call anything against the server. 
Here is my test program:
   
   ```C#
           static async Task Main(string[] args)
           {
               GrpcChannel channel = 
GrpcChannel.ForAddress("http://localhost:5005";);
               FlightClient flightClient = new FlightClient(channel);
   
               var actions = flightClient.ListActions();
               while (await actions.MoveNext(default))
               {
                   Console.WriteLine(actions.Current);
               }
   
               System.Console.WriteLine("Done");
           }
   ```
   
   And I get this exception:
   
   ```
   Unhandled exception. Grpc.Core.RpcException: Status(StatusCode="Internal", 
Detail="Error starting gRPC call. HttpRequestException: An error occurred while 
sending the request. IOException: The response ended prematurely.", 
DebugException="System.Net.Http.HttpRequestException: An error occurred while 
sending the request.
    ---> System.IO.IOException: The response ended prematurely.
      at System.Net.Http.HttpConnection.FillAsync()
      at System.Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync(Boolean 
foldedHeadersAllowed)
      at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage 
request, CancellationToken cancellationToken)
      --- End of inner exception stack trace ---
      at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage 
request, CancellationToken cancellationToken)
      at 
System.Net.Http.HttpConnectionPool.SendWithNtConnectionAuthAsync(HttpConnection 
connection, HttpRequestMessage request, Boolean doRequestAuth, 
CancellationToken cancellationToken)
      at 
System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage 
request, Boolean doRequestAuth, CancellationToken cancellationToken)
      at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, 
CancellationToken cancellationToken)
      at Grpc.Net.Client.Internal.GrpcCall`2.RunCall(HttpRequestMessage 
request, Nullable`1 timeout)")
      at 
Grpc.Net.Client.Internal.HttpContentClientStreamReader`2.MoveNextCore(CancellationToken
 cancellationToken)
      at Apache.Arrow.Flight.StreamReader`2.MoveNext(CancellationToken 
cancellationToken) in 
/Users/eerhardt/git/arrow/csharp/src/Apache.Arrow.Flight/StreamReader.cs:line 46
      at ArrowFlightTest.Program.Main(String[] args) in 
/Users/eerhardt/DotNetTest/ArrowFlightTest/Program.cs:line 17
      at ArrowFlightTest.Program.<Main>(String[] args)
   ```
   
   One part that confuses me is the example server says the address is 
`grpc+tcp://localhost:5005`, but the .NET gRPC client throws with that address 
saying only `http` and `https` schemes are supported. So that's why I used 
`http://localhost:5005`.


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