@Override
    public T setDouble(K name, double value) {
        throw new UnsupportedOperationException("read only");
    }
@Test
    public void testSetDouble() {
        assertThrows(UnsupportedOperationException.class, new Executable() {
            @Override
            public void execute() {
                HEADERS.setDouble("name", 0);
            }
        });
    }