Sending file to the user gives UnicodeEncodeError in Flask framework

Question

I want to send the user a file when he clicks the appropriate button and I'm suing the following.

# Prepare selected file for download...
send_file( '/home/nikos/wsgi/static/files/' + filename )

But no matter what file the usser selects iam always receiving this response.

[Wed Sep 12 14:10:48.450211 2018] [wsgi:error] [pid 5172] [remote 46.103.174.201:14089]   File "/home/nikos/wsgi/downloads.py", line 182, in file
[Wed Sep 12 14:10:48.450214 2018] [wsgi:error] [pid 5172] [remote 46.103.174.201:14089]     send_file( '/home/nikos/wsgi/static/files/' + filename )
[Wed Sep 12 14:10:48.450219 2018] [wsgi:error] [pid 5172] [remote 46.103.174.201:14089]   File "/usr/lib/python3.6/site-packages/flask/helpers.py", line 592, in send_file
[Wed Sep 12 14:10:48.450221 2018] [wsgi:error] [pid 5172] [remote 46.103.174.201:14089]     file = open(filename, 'rb')
[Wed Sep 12 14:10:48.450237 2018] [wsgi:error] [pid 5172] [remote 46.103.174.201:14089] UnicodeEncodeError: 'ascii' codec can't encode characters in position 30-39: ordinal not in range(128)

How will I be able to send the selected file to the user?

Vineeth Sai · Accepted Answer · 2018-09-12 12:06:06Z

1

Try this.. Before sending the file do,

file_name.encode('utf-8')

So pass these additional parameters to send_file(), I've got these from this thread

attachment_filename=file_name.encode('utf-8'),as_attachment=True, conditional=True

So your send_file might look like this...

filepath = '/home/nikos/wsgi/static/files/' + filename
filepath = filepath.encode('utf-8')

send_file(attachment_filename=filepath,as_attachment=True, conditional=True)

Let me know if it worked so I can try further.

edited Sep 12, 2018 at 12:06

answered Sep 12, 2018 at 11:29

Vineeth Sai

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10 Comments

Νικόλαος Βέργος Over a year ago

I'am consused. Could you please show me exactly how i should reform my code?

Vineeth Sai Over a year ago

Post the name of the file once(filename). I think the filename is causing the issue.

Νικόλαος Βέργος Over a year ago

send_file ( filepath, attachment_filename=filepath, as_attachment=True, conditional=True ) i get TypeError: cannot use a string pattern on a bytes-like object

Νικόλαος Βέργος Over a year ago

The filename after checking ti it has the correct value. send_file ( attachment_filename=filepath, as_attachment=True, conditional=True ) outputs this error TypeError: send_file() missing 1 required positional argument: 'filename_or_fp

Vineeth Sai Over a year ago

Try this line... send_file(filename.decode('utf-8'), attachment_filename=filepath, as_attachment=True ) This should probably fix your TypeError

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