import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
import java.nio.charset.StandardCharsets;
import java.util.zip.DeflaterOutputStream;

public class HttpClientCompressionExample {
    public static void main(String[] args) throws Exception {
        // HttpClient 인스턴스 생성
        CloseableHttpClient httpClient = HttpClientBuilder.create().build();

        // 웹 서버 URL 설정
        String url = "http://www.example.com/api";

        // 요청 데이터 생성
        String requestData = "This is the data to be compressed.";

        // 데이터 압축
        byte[] compressedData = compressData(requestData.getBytes(StandardCharsets.UTF_8));

        // HTTP POST 요청 생성
        HttpPost request = new HttpPost(url);

        // 압축된 데이터 설정
        request.setEntity(new ByteArrayEntity(compressedData));

        // 요청을 실행하고 응답 받기
        HttpResponse response = httpClient.execute(request);

        // 응답 데이터 읽기
        HttpEntity responseEntity = response.getEntity();
        String responseData = EntityUtils.toString(responseEntity);

        // 응답 데이터 출력
        System.out.println("Response data: " + responseData);

        // HttpClient 종료
        httpClient.close();
    }

    private static byte[] compressData(byte[] data) throws Exception {
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
        DeflaterOutputStream deflaterStream = new DeflaterOutputStream(byteStream);

        deflaterStream.write(data);
        deflaterStream.finish();

        deflaterStream.close();

        return byteStream.toByteArray();
    }
}