gRPC service not working as expected

Finally got my service running with gRPC, server implemented (probably ok) and client implemented (probably ok), but I get weird errors when calling a gRPC endpoint. JSON works as expected:
gives me a result like:

This is as it was, so I decorated the request and response:

  [Route("/endswith/{Suffix}", Summary = "Woorden vinden die eindigen op een suffix")]
  public class EndsWithSuffixRequest : IReturn<EndsWithSuffixResponse>
    [DataMember(Order = 1),
      ApiMember(Name = "Suffix", Description = "Suffix op te zoeken", DataType = "string", IsRequired = true)]
    public string Suffix { get; set; }

  public class EndsWithSuffixResponse
    [DataMember(Order = 1)]
    public SearchResult Result { get; set; }
    [DataMember(Order = 2)]
    public int Count { get; set; }
    [DataMember(Order = 3)]
    public List<string> Words { get; set; }

When I look at the generated code (csharp) this seems perfect https://localhost:5001/types/csharp gives

Now, when I try to call it through gRPC from a client with

private async Task<EndsWithSuffixResponse> GetEndsWithSuffixAsync(EndsWithSuffixRequest request)
  var client = new GrpcServiceClient(backendUri);
  var response = await client.GetAsync(request);
  return response;

then I DO see a response from the server:

and this on the client:

Apparently a 404. So, I wanted to test with the proto file, but that does not work either
the link https://localhost:5001/types/proto gives a 500 error

I cannot see why. The exception does not bubble up on the server side.

Please advise.

I’ve added the Service in this example as a test in the new GrpcServiceIssues.cs and it’s working as expected. I’ve assumed SearchResult is a simple POCO.

Can you modify a local copy and change it to repro the issue.