WebGL + GRPC does not work after build

Unity Engine
,
1

Hey guys,
I wrote a GrpcService Class:

using System.Net.Http;
using System.Threading.Tasks;
using Grpc.Core;
using Nimbus.Core.Grpc;
using Nimbus.Core.Grpc.WebApi;
using Grpc.Net.Client;
using Grpc.Net.Client.Web;
using FileContentResponse;

public class GrpcService
{
    private readonly GrpcChannel _channel;
    private const string PRODUCTION_SERVER_URL = "https://api.xxxxxx.com";

    public GrpcService(string token)
    {
        _channel = CreateAuthenticatedChannel(PRODUCTION_SERVER_URL, token);
    }

    private GrpcChannel CreateAuthenticatedChannel(string address, string token)
    {
        var credentials = CallCredentials.FromInterceptor((_, metadata) =>
        {
            if (!string.IsNullOrEmpty(token))
            {
                metadata.Add("Authorization", $"Bearer {token}");
            }
            return Task.CompletedTask;
        });
     
        var channel = GrpcChannel.ForAddress(address, new GrpcChannelOptions
        {
            HttpHandler = new GrpcWebHandler(new HttpClientHandler()),
            Credentials = ChannelCredentials.Create(new SslCredentials(), credentials),
            MaxReceiveMessageSize = 1024 * 1024 * 50, // Set the maximum message size to 50 MB
            MaxSendMessageSize = 1024 * 1024 * 50 // Set the maximum message size to 50 MB
        });
     
        return channel;
    }

    public FileContentResponse GetFileContentById(string id)
    {
        id = RemoveFilesSubstring(id);
        var _filesServiceClient = new FilesService.FilesServiceClient(_channel);
        var request = new IdRequest
        {
            Id = id
        };
  
        return _filesServiceClient.GetFileContentById(request);
    }

    private string RemoveFilesSubstring(string input)
    {
        int index = input.IndexOf("/files/");
        return index >= 0 ? input.Substring(index + "/files/".Length) : input;
    }

    private void OnDisable() {
        _channel.ShutdownAsync().Wait();
    }
}

I have successfully get response from my server using this class at the Editor level, but when I build I get the following error:

Grpc.Core.RpcException: Status(StatusCode="Internal", Detail="Error starting gRPC call. DllNotFoundException: Unable to load DLL 'libc'. Tried the load the following dynamic libraries: ", DebugException="System.DllNotFoundException: Unable to load DLL 'libc'. Tried the load the following dynamic libraries:
")

I could not find any information or documentation regarding GRPC and WebGL…
Any Ideas?

2

Unfortunately, you can’t use .NET networking classes because JavaScript code doesn’t have direct access to IP Sockets to implement network connectivity, see the docs here to see what is available to you that’s supported on WebGL.