例

    using UnityEngine;
    using System.Collections;
    public class MyBehavior : MonoBehaviour {
            StartCoroutine(Upload());
        }
        IEnumerator Upload() {
            byte[] myData = System.Text.Encoding.UTF8.GetBytes("This is some test data");
            yield return www.SendWebRequest();
            if(www.isNetworkError || www.isHttpError) {
                Debug.Log(www.error);
            }
            else {
                Debug.Log("Upload complete!");
            }
        }