private static void readSettingsFrame(InputStream in) throws Exception {
        final byte[] expected = {
                0x00, 0x00, 0x0c, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x02, 0x00, 0x00, 0x00, 0x00, // SETTINGS_ENABLE_PUSH = 0 (disabled)
                0x00, 0x06, 0x00, 0x00, 0x20, 0x00 // MAX_HEADER_LIST_SIZE = 8192
        };
        assertThat(readBytes(in, expected.length)).containsExactly(expected);
    }
This test is to check the behavior of the HttpClient when the 'Expect: 100-continue' header is set.
core/src/test/java/com/linecorp/armeria/client/HttpClientExpect100HeaderTest.java