using System;

using System.IO;

using System.IO.Compression;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

public class Program

{

    public static async Task Main()

    {

        var payload = "H4sIAAAAAAAACsyVTY/aMBCG/0rkM1TjxElMbmi16qKWdgVIVVv1MNgGrAYb2U6lLeK/dwIc2u4eOEVIvmQ+/D7zJo6PTGNC1nw/MuW1YQ17AChElU/KajKfshGLvguqT5gueCqmkMJktj68UHCqlO9cevAuoepzwSQbjP7sWOO6th0xTCnYdZdMZM3xNGIpoIstJutdH2GGKtkCf5q4y5bWbVtkVHUI/mBCspeu0+gVXlWXSzEU3nvbZtMXbG8jk48fVkORrTD4bG6sCTex1Xz2dXavbBLyL3fKJjlIea9s5fy5HIptubMOsyfUNu5uo5NPi0+DnVNsbboBqwAhFnMYCmumvcVs3iXbeswWXge77czv20CrxezjUKDTvU30ch0689a/7gdpkkLoJa7bRuM0fafXp52N6QxE14lp8RCNZg3nBckrSpDCc/C/LHXER7e1zmRTvbcxEkQ/YsLUkRJbdkqZGCmU7N4sE+4PFM0hL8acjzmsOKddG6jfgZjARFTfWM/2/4h72gO3ZkYMDPW6zJXIoa61kLxa5yXUUmFZbTgYjb2dPgSC7h05t1yNHv/r7bgqZFHmNBSXAJIXeX/2yKie+NKnJtrkZV5uAAXfVCiENkpXG1kKuQZN5Vey1V/TAQAfn9cKoDkvKuztPxNdHD79AQAA//8=";

        var input = Convert.FromBase64String(payload);

        using var inputStream = new MemoryStream(input.ToArray());

        using var outStream = new MemoryStream();

        using var compressionStream = new GZipStream(inputStream, CompressionMode.Decompress);

​

        await compressionStream

            .CopyToAsync(outStream)

            .ConfigureAwait(false);

​

        var content = Encoding.UTF8.GetString(outStream.ToArray());

        Console.WriteLine(content);

    }

}