Single-file Java script for downloading a PNG image from a URL

ImageScraper.java

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.nio.file.Path;

class ImageScraper {
	public static void main(String[] args) throws IOException, InterruptedException {
		if (args.length < 1 || args[0].isBlank()) throw new IllegalArgumentException("Missing required URL.");
		String url = args[0].trim();
		var request = HttpRequest.newBuilder(URI.create(url))
				.GET()
				.header("Accept", "image/png")
				.build();
		Path file; // If user supplies a second arg, use that as the filename, otherwise use "image.png"
		if (args.length >= 2 && !args[1].isBlank() && args[1].endsWith(".png")) {
			file = Path.of(args[1]);
		} else {
			file = Path.of("image.png");
		}
		// Send the HTTP request and download the file.
		HttpClient.newHttpClient().send(request, HttpResponse.BodyHandlers.ofFile(file));
		System.out.printf("Downloaded image from %s to %s.\n", url, file.toAbsolutePath());
	}
}