Downloading file using Apache HttpClient (>= v4.2) with support to HTTP REDIRECT 301 and 302 when using HTTP method GET or POST

App.java

public class App {
	
	public static void main(String[] args) throws MalformedURLException {
		
		URL rightUrl = new URL("http://cursos.triadworks.com.br/assets/css/main.css");
		URL redirectableUrl = new URL("http://www.triadworks.com.br/assets/css/main.css"); // redirected to cursos.triadworks.com.br

		Downloader downloader = new Downloader();
		
		System.out.println("Downloading file through right Url...");
		downloader.download(rightUrl, new File("main-ok.css"));
		
		System.out.println("Downloading file through a redirectable Url...");
		downloader.download(redirectableUrl, new File("main-redirected.css"));
		
	}
}

Downloader.java

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.client.LaxRedirectStrategy;

public class Downloader {

	public File download(URL url, File dstFile) {
		CloseableHttpClient httpclient = HttpClients.custom()
				.setRedirectStrategy(new LaxRedirectStrategy()) // adds HTTP REDIRECT support to GET and POST methods 
				.build();
		try {
			HttpGet get = new HttpGet(url.toURI()); // we're using GET but it could be via POST as well
			File downloaded = httpclient.execute(get, new FileDownloadResponseHandler(dstFile));
			return downloaded;
		} catch (Exception e) {
			throw new IllegalStateException(e);
		} finally {
			IOUtils.closeQuietly(httpclient);
		}
	}
	
	static class FileDownloadResponseHandler implements ResponseHandler<File> {

		private final File target;

		public FileDownloadResponseHandler(File target) {
			this.target = target;
		}

		@Override
		public File handleResponse(HttpResponse response) throws ClientProtocolException, IOException {
			InputStream source = response.getEntity().getContent();
			FileUtils.copyInputStreamToFile(source, this.target);
			return this.target;
		}
		
	}
	
}

Perfectly works, Thanks

Great job! 👍

It helped 👍

It helped +1

Thank you!
Tips for others who want to use it: if use maven , pom.xml needs to add the following from https://mvnrepository.com/artifact/org.apache.directory.studio/org.apache.commons.io

It worked perfectly. Thank you!

I have been looking for this since so long, and finally found it. My use case was to store api response into zip file as its in byte array but was not able to store it into .zip in RestAssured.
If any one knows the alternative for this in RestAssured would be helpful.
Thanks in Advance !