Flask: force download pdf files to open in browser
You can try to add the mimetype parameter to send_from_directory:
return send_from_directory(directory=some_directory, filename=filename, mimetype='application/pdf')That works for me, at least with Firefox.
If you need more control over headers, you can use a custom response, but you will lose the advantages of send_file() (I think it does something clever to serve the file directly from the webserver.)
with open(filepath) as f: file_content = f.read()response = make_response(file_content, 200)response.headers['Content-type'] = 'application/pdf'response.headers['Content-disposition'] = ...return response