@Test
    public void testOnConnectMethod() {
        CurlRequest request = new CurlRequest(Method.GET, "https://example.com");

        CurlRequest result = request.onConnect((req, conn) -> {
            conn.setConnectTimeout(5000);
        });

        assertSame(request, result); // Fluent API
    }

    @Test
    public void testParamMethod() {