.NET Fiddle

CSharp · Console

/Program.cs

using System;
using System.Net;
					
public class Program
{
	public static void Main()
	{
		ServicePointManager.Expect100Continue = true;
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
        WebClient client = new WebClient();
        string s = client.DownloadString("https://physics.nist.gov/cgi-bin/cuu/CCValue?mal|ShowSecond=Browse&First=malc2");
		Console.WriteLine(s);
	}
}