}
    }

    public Map<String, List<String>> getHeaders() {
        return headers;
    }

    public String[] getHeaderValues(final String name) {
        final List<String> list = headers.get(name.toLowerCase(Locale.ROOT));
        if (list == null) {
            return new String[0];
        }
        return list.toArray(new String[list.size()]);
    }

import java.util.logging.Logger;

import org.junit.Test;

public class CurlTest {
    private static final Logger logger = Logger.getLogger(CurlTest.class.getName());

    @Test
    public void test_Get() {
        Curl.get("https://www.codelibs.org/").execute(response -> {
            final String content = response.getContentAsString();
            logger.info(content);
            assertTrue(content.length() > 0);
        }, e -> {

public class Curl {

    public static final File tmpDir = new File(System.getProperty("java.io.tmpdir"));

    protected Curl() {
        // nothing
    }

    public static CurlRequest get(final String url) {
        return new CurlRequest(Method.GET, url);
    }

    public static CurlRequest post(final String url) {
        return new CurlRequest(Method.POST, url);
    }

    public static CurlRequest put(final String url) {

                }
            });
        }

        private void writeContent(final Supplier<InputStream> handler) {
            try (BufferedInputStream bis = new BufferedInputStream(handler.get());
                    ContentOutputStream dfos = new ContentOutputStream(threshold, Curl.tmpDir)) {
                final byte[] bytes = new byte[4096];
                int length = bis.read(bytes);