Passing Correlation Id to subsequent request

HttpClient.cs

public class Startup
{
    public virtual void ConfigureServices(IServiceCollection services)
    {      
       services.AddHttpClient<IMyServiceClient, MyServiceClient>((serviceProvider, client) =>
            {
                client.BaseAddress = customerCoreServiceOptions.BaseUri;
                client.DefaultRequestHeaders.Add("correlation-id",
                                                 CorrelationIdContext.GetCorrelationId() ??
                                                 Guid.NewGuid().ToString());
            });
    }

    public void Configure(IApplicationBuilder app)
    {
      // Code removed for brevity
    }
}