Fixed encoding issue in file download

src/main/java/it/inaf/ia2/transfer/controller/GetFileController.java

@@ -9,6 +9,8 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.UncheckedIOException;
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import java.util.Optional;
 import javax.servlet.http.HttpServletResponse;
 import org.slf4j.Logger;
@@ -99,11 +101,13 @@ public class GetFileController extends FileController {
 
         String vosName = fileInfo.getVirtualPath().substring(fileInfo.getVirtualPath().lastIndexOf("/") + 1);
         
-        response.setHeader("Content-Disposition", "attachment; filename=" + vosName);
+        response.setHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(vosName, StandardCharsets.UTF_8));
         response.setHeader("Content-Length", String.valueOf(file.length()));
+        response.setCharacterEncoding("UTF-8");
 
         byte[] bytes = new byte[1024];
-        try ( OutputStream out = response.getOutputStream();  InputStream is = new FileInputStream(file)) {
+        try (OutputStream out = response.getOutputStream();
+                InputStream is = new FileInputStream(file)) {
             int read;
             while ((read = is.read(bytes)) != -1) {
                 out.write(bytes, 0, read);