.NET CORE 3.1 ERROR 500 during WebSocket handshake - apache

Question

I am using SignalR on my .net core 3.1 API and it all works on localhost
hosting my app on ubuntu 20.4 will result in error 500 during handshake...
I am pretty sure I am missing something on my Apache configs...
error is just "Error during WebSocket handshake: Unexpected response code: 500" no extra data although -> options.EnableDetailedErrors = true
any idea why it doesn't work?
this my Startup.cs:
public void ConfigureServices(IServiceCollection services)
{
services.AddCors(options =>
{
options.AddPolicy("CorsPolicy",
builder => builder.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyHeader());
});
services.AddSignalR(options =>
{
options.EnableDetailedErrors = true;
}).AddJsonProtocol(options =>
{
options.PayloadSerializerOptions.PropertyNamingPolicy = null;
});
services.AddControllers();
// Configure Compression level
services.Configure<GzipCompressionProviderOptions>(options => options.Level = CompressionLevel.Fastest);
// Add Response compression services
services.AddResponseCompression(options =>
{
options.Providers.Add<GzipCompressionProvider>();
options.EnableForHttps = true;
});
services.AddTransient<IActionContextAccessor, ActionContextAccessor>();
JsonSerializerSettings jsonSettings = new JsonSerializerSettings
{
NullValueHandling = NullValueHandling.Include,
// ContractResolver = new CamelCasePropertyNamesContractResolver()
};
jsonSettings.Converters.Add(new StringEnumConverter());
services.AddMvc().AddNewtonsoftJson(options =>
{
options.SerializerSettings.ContractResolver = new DefaultContractResolver();
});
services.AddDistributedMemoryCache();
services.AddOptions();
services.Configure<IConfiguration>(Configuration);
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IDistributedCache cache)
{
app.UseResponseCompression();
app.UseDeveloperExceptionPage();
app.UseHttpsRedirection();
app.UseRouting();
app.UseCors("CorsPolicy");
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllers();
endpoints.MapHub<AnalyticsHub>("/AnalyticsHub");
endpoints.MapHub<CampaignHub>("/CampaignHub");
endpoints.MapHub<LinkHub>("/LinkHub");
});
app.UseStaticFiles();
}
the error: