Streaming ZIP directly to client.java

package xyz.spookle.httpstreamtesting;

import org.springframework.core.io.InputStreamResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.util.MimeType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;
import java.io.InputStream;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.zip.Deflater;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

@RestController
@RequestMapping("/")
public class TestController {

	@GetMapping("/test")
	public ResponseEntity<InputStreamResource> wow() throws IOException {
		URL url = new URL("https://speed.hetzner.de/100MB.bin");
		HttpURLConnection con = (HttpURLConnection) url.openConnection();
		con.setRequestMethod("GET");
		InputStream responseInputStream = con.getInputStream();

		PipedOutputStream outputStream = new PipedOutputStream();
		PipedInputStream inputStream = new PipedInputStream(outputStream);

		new Thread(() -> {
			byte[] buffer = new byte[1024];
			int count;
			try (ZipOutputStream zout = new ZipOutputStream(outputStream)) {
				zout.setLevel(Deflater.NO_COMPRESSION);
				zout.putNextEntry(new ZipEntry("test.html"));
				while ((count = responseInputStream.read(buffer)) > 0) {
					zout.write(buffer, 0, count);
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}).start();


		HttpHeaders httpHeaders = new HttpHeaders();
		httpHeaders.setContentType(MediaType.asMediaType(MimeType.valueOf("application/zip")));
		InputStreamResource isr = new InputStreamResource(inputStream);
		return new ResponseEntity<>(isr, httpHeaders, HttpStatus.OK);
	}
}