This parameter was introduced to replace the older attachment_filename argument. If you see this error, your environment is likely running an outdated version of Flask where this keyword does not yet exist. Why This Error Happens
return send_file(path, as_attachment=True, attachment_filename='my_file.pdf') Use code with caution. Other Renamed Parameters This parameter was introduced to replace the older
The best solution is to update your Flask package to at least version 2.0 so you can use modern syntax and benefit from security updates. pip install --upgrade Flask Use code with caution. You can verify your current version by running: flask --version Use code with caution. Or check it in a Python shell : import flask print(flask.__version__) Use code with caution. 2. Use the Older Parameter Name Other Renamed Parameters The best solution is to
If you are forced to use an older version of Flask (e.g., in a legacy project), swap download_name for attachment_filename . Or check it in a Python shell : import flask print(flask
If you are upgrading from an older version, be aware of other parameters that were renamed alongside download_name : cache_timeout is now . add_etags is now etag . filename (in send_from_directory ) is now path .
The error TypeError: send_file() got an unexpected keyword argument 'download_name' occurs when you use the download_name parameter in a version of Flask older than .