python3 flask 文件下载服务器

from flask import Flask, send_from_directory
import os

cur_dir=os.path.dirname(__file__)

app = Flask(__name__)

@app.route("/download")
def index():
    return send_from_directory(cur_dir,filename="test.png",as_attachment=True)

if __name__ == ‘__main__‘:
    print(app.url_map)
    app.run(host="0.0.0.0", port=9900)

http://127.0.0.1:9900/download