fail("Expected CurlException");
        } catch (CurlException e) {
            assertTrue(e.getMessage().contains("body method is already called"));
        }
    }

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

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