Page's HTML code written into file when file is downloaded from web app

Question

I have a downloadfile servlet code that will dynamically add contents into a CSV file for users to download. However instead of having the contents I want added into the CSV file, the page's HTML code appears in the file instead. Can anyone tell me what is causing this bug? Here's my controller code

response.setContentType("text/csv");
response.setHeader("Content-Disposition", "attachment"; 
filename="\\evaluations.csv\\");

try
{
    OutputStream outputStream = response.getOutputStream();
    String outputResult = "xxxx, yyyy, zzzz, aaaa, bbbb, ccccc, dddd, eeee, ffff, gggg\n";
    outputStream.write(outputResult.getBytes());
    outputStream.flush();
    outputStream.close();
} catch(Exception e) {
    status = "Error exporting file, please try again later";
    System.out.println(e.toString());
}
        
//request.setAttribute("status",status);
//dispatcher = request.getRequestDispatcher("/viewEvaluations.jsp");
//dispatcher.forward(request, response);

EDIT:

Removing the forward request actually stop the HTML code from being copied into the file and I also realized its redundant and I've commented them out. This was the code that was causing the problem.