apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/component/RetryableRestTemplate.java/RetryableRestTemplate/get
class RetryableRestTemplate:  public <T> T get(Env env, String path, Class<T> responseType, Object... urlVariables)
      throws RestClientException {
    return execute(HttpMethod.GET, env, path, null, responseType, urlVariables);
  }