HyperCube/Post.cs

using System;
using System.IO;
using System.Net;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace HyperCube
{
    public class Post
    {
        public static async Task<string> PostRequestAsync(string json)
        {
            Console.WriteLine($"json req {json} len {json.Length}");
            var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://127.0.0.1:8545");

            httpWebRequest.ContentType = "application/json";
            httpWebRequest.Method = "POST";
            httpWebRequest.Accept = "application/json";
            

            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            {
                streamWriter.Write(json);
            }

            HttpWebResponse response = (HttpWebResponse)await httpWebRequest.GetResponseAsync();
            using (Stream stream = response.GetResponseStream())
            {
                using (StreamReader reader = new StreamReader(stream))
                {
                    //Console.WriteLine(reader.ReadToEnd());

                    var result = reader.ReadLine();
                    Console.WriteLine($"json result {result} len {result.Length}");
                    response.Close();
                    return result;
                }
            }
            
            //using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
            //{
            //    streamWriter.Write(json);
            //}

            //var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            //using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
            //{
            //    var result = streamReader.ReadToEnd();
            //    Console.WriteLine($"json result {result} len {result.Length}");
            //    answer = result;
            //}
        }
    }
}