in uber-core/src/main/java/com/uber/sdk/core/auth/AccessTokenAuthenticator.java [121:127]
boolean signedByOldToken(Response response, AccessToken oAuth2Token) {
String value = ApiInterceptor.getAuthorizationHeader(response.request());
String accessToken = createBearerToken(oAuth2Token);
return value != null && !value.equals(accessToken);
}