String url = CommonHelper.addParameter(EXCHANGE_TOKEN_URL, OAuthConstants.CLIENT_ID, this.key);
url = CommonHelper.addParameter(url, OAuthConstants.CLIENT_SECRET, this.secret);
url = CommonHelper.addParameter(url, EXCHANGE_TOKEN_PARAMETER, accessToken.getToken());
final ProxyOAuthRequest request = createProxyRequest(url);
final long t0 = System.currentTimeMillis();
final Response response = request.send();
final int code = response.getCode();
body = response.getBody();
final long t1 = System.currentTimeMillis();
logger.debug("Request took : " + (t1 - t0) + " ms for : " + url);
logger.debug("response code : {} / response body : {}", code, body);
if (code == 200) {
logger.debug("Retrieve extended token from : {}", body);