public void GetString(string url, EventHandlerHTTPString stringCallback, EventHandlerOnError errorCallback, EventHandlerOverTime overTime = null)
 {
     StartCoroutine(RunGetStringCoroutine(url, stringCallback, errorCallback, overTime));
 }
    private IEnumerator RunGetStringCoroutine(string url, EventHandlerHTTPString stringCallback, EventHandlerOnError errorCallback, EventHandlerOverTime overTime = null)
    {
        WWW www = new WWW(url);

        while (!www.isDone)
        {
            yield return(null);

            if (overTime != null && CheckTimeOut(www) && !GlobalValues.IsDownloadOverTime)
            {
                GlobalValues.IsDownloadOverTime = true;
                overTime("progress" + www.progress);
            }
        }

        if (string.IsNullOrEmpty(www.error))
        {
            if (stringCallback != null)
            {
                stringCallback(www.text, www.responseHeaders);
            }
            else
            {
                Debug.Log("no request Log Error");
                yield return(null);
            }
        }
        else
        {
            if (errorCallback != null)
            {
                errorCallback(www.error);
            }
        }

        if (www != null)
        {
            www.Dispose();
            www = null;
        }
    }