public static String encode(String s) {
		return encode(s, UTF_8);
	}
@Test
	public void testEncodeDecode2() {

		String origin = null;
		String encode1 = UrlUtils.encode(origin);
		assertThat(encode1).isNull();

		origin = "";
		encode1 = UrlUtils.encode(origin);
		assertThat(encode1).isEqualTo(origin);
	}