UnityでHttpWebRequestを使う

Test.cs

using UnityEngine;
using System.IO;
using System.Net;
using System.Text;

public class Test : MonoBehaviour {
  private string txt = "";
	
	void OnGUI () {
		if (GUI.Button(new Rect(10, 10, 200, 100), "テスト")) {
			WebRequest request = HttpWebRequest.Create("http://japan.unity3d.com/");
			request.Method = "GET";
			WebResponse resp = null;
			try {
				resp = request.GetResponse();
			} catch {
				resp = null;
			}
			
			if (resp != null) {
				Stream st = resp.GetResponseStream();
				StreamReader sr = new StreamReader(st, Encoding.GetEncoding("UTF-8"));
				txt = sr.ReadToEnd();
				sr.Close();
				st.Close();
			}
		}
		GUI.TextArea(new Rect(10, 120, Screen.width-20, 300), txt);
	}
}