Receiving 502 error on singlar/negotiation post request

[KarachentsevDanil]

I am trying to add SignalR to the gateway.
OcelotConfiguration.json

{
      "DownstreamPathTemplate": "/{catchAll}/negotiate",
      "DownstreamScheme": "http",
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",
          "Port": 44345
        }
      ],
      "UpstreamHttpMethod": [ "POST", "OPTIONS" ],
      "UpstreamPathTemplate": "/gateway/{catchAll}/negotiate"
    },
    {
      "DownstreamPathTemplate": "/{catchAll}",
      "DownstreamScheme": "ws",
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",
          "Port": 44345
        }
      ],
      "UpstreamPathTemplate": "/gateway/{catchAll}",
      "UpstreamHttpMethod": [ "GET", "POST", "PUT", "DELETE", "OPTIONS" ]
    },

Startup.cs
Configure method

        applicationBuilder.UseCors(CorsPolicyName);

        if (ocelotConfiguration.IsOcelotSwaggerEnabled)
        {
            applicationBuilder.UseSwaggerForOcelotUI();
        }

        applicationBuilder.UseStaticFiles();
        applicationBuilder.UseWebSockets();
        applicationBuilder.UseOcelot().Wait();

Error:

Dependencies of Gateway

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="5.0.2" />
    <PackageReference Include="PFH.Ruleset" Version="1.0.0" />
    <PackageReference Include="PFH.Shared.Utils" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="5.0.2" />
    <PackageReference Include="MMLib.Ocelot.Provider.AppConfiguration" Version="2.0.0" />
    <PackageReference Include="MMLib.SwaggerForOcelot" Version="4.0.1" />
    <PackageReference Include="Ocelot" Version="17.0.0" />
  </ItemGroup>

Fragment of the startup of application with SignalR

app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
                endpoints.MapHub<ChatHub>("/signalr/chats", options =>
                {
                    options.Transports = HttpTransportType.WebSockets;
                });
                endpoints.MapHealthChecksUI();
                endpoints.MapHealthChecks("health-check-api", new HealthCheckOptions
                {
                    Predicate = _ => true,
                    ResponseWriter = UIResponseWriter.WriteHealthCheckUIResponse
                });
            });

[OleksandrAntoniuk]

Hi, @KarachentsevDanil, I had the same issue, so we had to configure skip negotiation = true on the UI side

[ckapatch]

Unfortunately, that setting cannot be used if using Azure SignalR Service

[Nodnarb3]

Did anyone ever get this working, in the same boat?