CurlRequest result = request.header("Content-Type", "application/json").header("Accept", "application/json");

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

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

        CurlRequest result = request.threadPool(pool);