@Override
    public boolean contains(CharSequence name, CharSequence value) {
        return contains(name, value, false);
    }
@Test
    public void testContainsNameAndValue() {
        Http2Headers headers = newHeaders();
        assertTrue(headers.contains("name1", "value2"));
        assertFalse(headers.contains("name1", "Value2"));
        assertTrue(headers.contains("2name", "Value3", true));
        assertFalse(headers.contains("2name", "Value3", false));
    }