If you prefer Axios, ensure you set the responseType to 'blob' to prevent the library from trying to parse the binary data as text or JSON. javascript
This guide explores how to bridge that gap by handling binary data on the frontend to trigger a successful download. 1. The Backend: Serving Files with Flask send_file flask send_file ajax download
If your Flask backend sets a dynamic filename using download_name , the frontend can extract it from the Content-Disposition header. If you prefer Axios, ensure you set the
from flask import Flask, send_file, request import io app = Flask(__name__) @app.route('/download-report', methods=['POST']) def download_report(): # Example: Generating a text file in memory data = "This is your generated report content." buffer = io.BytesIO() buffer.write(data.encode('utf-8')) buffer.seek(0) return send_file( buffer, as_attachment=True, download_name='report.txt', mimetype='text/plain' ) Use code with caution. The Backend: Serving Files with Flask send_file If