DFrame_3.cs

using DFrame;
using Microsoft.Extensions.DependencyInjection;

// use builder can configure services, logging, configuration, etc.
var builder = DFrameApp.CreateBuilder(7312, 7313);
builder.ConfigureServices(services =>
{
    services.AddSingleton<HttpClient>();
});
await builder.RunAsync();

public class HttpGetString : Workload
{
    readonly HttpClient httpClient;
    readonly string url;

    // HttpClient is from DI, URL is passed from Web UI
    public HttpGetString(HttpClient httpClient, string url)
    {
        this.httpClient = httpClient;
        this.url = url;
    }

    public override async Task ExecuteAsync(WorkloadContext context)
    {
        await httpClient.GetStringAsync(url, context.CancellationToken);
    }
}