React excel download file is corrupt

I'm trying to load an Excel file in Reactjs by calling a Spring REST endpoint, but I'm having problems with a corrupted file.

Reaction to a call ...

getFile(){
    axios.get('get/download')
        .then((response) => {
            var blob = new Blob([response.data], {type:'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'});
            filesaver.saveAs(blob, "excel.xlsx");
        });
}

      

        
        
        
      

    

Spring controller ....

@RequestMapping(value = "/download", method = RequestMethod.GET)
    public void downloadExcelFile(final HttpServletResponse response) throws IOException {
        response.setHeader("Content-Encoding", "UTF-8");
        response.setHeader("Content-Disposition", "attachment; filename="file.xlsx");
        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");

        final File xls = service.createExcelFile(response);

        final FileInputStream in = new FileInputStream(xls);
        final OutputStream out = response.getOutputStream();

        final byte[] buffer = new byte[8192];
        int length;

        while ((length = in.read(buffer)) > 0) {
            out.write(buffer, 0, length);
        }
        in.close();
        out.close();
    }

      

        
        
        
      

    

Service...

 public File createExcelFile(final HttpServletResponse response) {
     XSSFWorkbook xssfWorkbook = null;
     final File xls = new File("excel.xlsx");
        try {
            final FileOutputStream fos = new FileOutputStream(xls);

            xssfWorkbook = new XSSFWorkbook();
            //setup excel file...
            xssfWorkbook.write(fos);
            xssfWorkbook.close();
       }
       catch (final Exception e) {
           LOGGER.error(String.format("Something went wrong"));
       }
    return xls;
 }

      

        
        
        
      

    

When I execute the above code, I get an excel file ok .. but looking at response.data looks like ...

"PKs  J_rels/.rels   j 0  }↵ {㴃1F ^Ơ 2  l%1I,c [ 

      

        
        
        
      

    

Tring to open the file I receive ... Could not open file due to unreadable data. Opening the file on the server is ok

Any ideas are appreciated

Greetings