public RetryableException(final String message, final Throwable cause,
                              final Date retryAfter, final ShenyuRequest request) {
        super(message, cause);
        this.httpMethod = request.getHttpMethod();
        this.retryAfter = Optional.ofNullable(retryAfter).map(Date::getTime).orElse(null);
    }
@Test
    public void retryableExceptionTest() {
        Assert.assertNotNull(retryableException);
    }