CurlRequest result = request.proxy(proxy);

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

    @Test
    public void testEncodingMethod() {
        CurlRequest request = new CurlRequest(Method.GET, "https://example.com");
        String encoding = "ISO-8859-1";

        CurlRequest result = request.encoding(encoding);