How to convert HttpWebRequest to use HttpClient

//@import System.Web;
//@import System.Linq.Expressions
//@import System.Private.Uri
//@import System.Net.Requests
//@import System.Net.WebHeaderCollection
//@import System.Collections.Specialized
//@import System.Text.Json
//@import System.Net.Http
using System;
using System.IO;
using System.Net;
using System.Net.Http;
using Innovation.Activate;
using Innovation.Activate.Utilities;






class Script : ScriptBase
{
    string _url = "https://jsonplaceholder.typicode.com/todos/1";


    public void main()
    {
        RunModernExample();
        //    RunLegacyExample();
    }




    public HttpClient GetHttpClient()
    {
        HttpClient http = ProvisioningSystem.ObjectCache.GetOrCreate<HttpClient>("CONNECTOR_MYCONNECTION", //The HttpClient should be created once and reused for the same connection. 
                                () =>
                {
                    var handler = new HttpClientHandler();


                    //Set Auth settings here
                    //handler.Credentials = ;


                    return new HttpClient(handler);
                });
        return http;
        
    }


    public void RunModernExample()
    {
        HttpClient http = GetHttpClient();
        string payload = "";


        HttpRequestMessage m = new HttpRequestMessage(HttpMethod.Get, _url);


        if (m.Method == HttpMethod.Post)
            m.Content = new StringContent(payload.ToString(), System.Text.Encoding.UTF8, "application/json");


        HttpResponseMessage r = http.Send(m);


        //Read the response
        using (Stream stream = r.Content.ReadAsStream())
        {
            //Read the stream in the response
            using (StreamReader reader = new StreamReader(stream, System.Text.Encoding.UTF8))
            {
                //Save all of the response to a string
                string result = reader.ReadToEnd();


                Trace.WriteLine(result);
            }
        }


    }


    public void RunLegacyExample()
    {
        HttpWebRequest request = WebRequest.Create(_url) as HttpWebRequest;


        request.Method = "GET";


        //Send the request
        WebResponse ws = request.GetResponse();


        //Read the response
        using (Stream stream = ws.GetResponseStream())
        {
            //Read the stream in the response
            using (StreamReader reader = new StreamReader(stream, System.Text.Encoding.UTF8))
            {
                //Save all of the response to a string
                string result = reader.ReadToEnd();


                Trace.WriteLine(result);


            }
        }
    }
}