title: Return ZIP file over AJAX
body: <p>I need to download files, which is triggered via AJAX. My code retrieves images from URLs in a temp folder, and creates an in memory zip of the the files in this temp folder. I want to push the file path to the client. How would I do it?</p>
  
  <p>Here is my zipping code:</p>
  
  <pre><code>#This function creates a temp folder, downloads images in it and returns the path
  temp_dir = retrieve_images(file_paths)
  
  in_memory_loc = io.BytesIO()
  
  zipf = zipfile.ZipFile(, 'w')
  zipdir(temp_dir, zipf)
  zipf.close()
  
  #remove the temp directory
  shutil.rmtree(temp_dir)
  
  in_memory_loc.seek(0)
  
  #output the zip file to the browser
  return send_file(in_memory_loc, attachment_filename='site_images.zip', as_attachment=False)
  </code></pre>
  
  <p>This works when I use the traditional form submit way. But I need to return this over AJAX. Returning a file over AJAX seems impossible, hence I want to return the  zip file path. How would I do it?</p>