Zip file is invalid from Flask send_fiile

Question

I'm very new to JS code and just take over left work from colleague.

When Flask code return zip file using send_file, the JS side download seems invalid. Other format, like text and csv are good.

The Server code snippet:

@bp.route('/download_file', methods=['POST'])
@login_required
def download_file():
    download_path = request.form.get("download_path")
    if os.path.exists(download_path):
        @after_this_request
        def send_response(response):
            return response
        return send_file(download_path, as_attachment=True)

The download path is file path located on my server

Blockquote

The JS code is below, the goal is user click the download button and file is downloaded.

$.post('/download_file', {'download_path' : download_path}).done(function(data) {
  var blob =new Blob([data]);
  var link = document.createElement('a');
  link.href = window.URL.createObjectURL(blob);
  link.download = "my.zip";
  link.click();
}).fail(function(data) {
  alert("danger", "Can't find download file");
});

Zip file is able to download but it's corrupted. My limit frontend debug experience shows data in Blob looks weird. Appreciate any help and suggestions

enter image description here

I am facing the same issue. have you fixed the issue? – Md Rahman Jun 03 '22 at 12:41 — Md Rahman, Jun 03 '22 at 12:41

score 0 · Answer 1 · answered Feb 15 '21 at 21:20

0

It could be the content type that is missing in the response:

response.headers['Content-Type'] = 'application/pdf'

answered Feb 15 '21 at 21:20

Farrukh Normuradov

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1

Thanks, but this one doesn't fix the issue. I still suspect the issue on JS side. The header['content-length'] = 304831 that is good zip size, but on JS side, the data.length is around 52000. I don't know why it has different size. – Daniel Y.Sui Feb 16 '21 at 00:14

Zip file is invalid from Flask send_fiile

1 Answers1