Flask：使用 GET 请求下载 .zip 文件

Question

Flask v1.1.2、Python v3.7

我正在尝试让 Flask 向我发送它根据 GET 请求生成的 .zip 文件。

我有一个页面，用户可以在其中单击下载按钮，该按钮发出 GET 请求并将键解析为值。基于此密钥创建 .zip 文件并将其移至我的 /static 文件夹。在被执行的处理程序下方：

    def download(self):
        key = request.args['action']
        zip_location = os.path.join(app.static_folder, "files.zip")
        res = self.recorder.down.download(key, zip_location)
        return send_file("static/files.zip", as_attachment=True)

我尝试使用send_file、send_from_directory、app.send_static_file 发送文件，但它们都导致出现相同的奇怪错误：

Serving Flask app "webapp.webUI" (lazy loading) 
Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
Debug mode: on
Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
Debugging middleware caught exception in streamed response at a point where response headers were already sent.
Traceback (most recent call last):
  File "/home/pi/somepath/env/lib/python3.7/site-packages/werkzeug/wsgi.py", line 506, in __next__
    return self._next()
  File "/home/pi/somepath/env/lib/python3.7/site-packages/werkzeug/wrappers/base_response.py", line 45, in _iter_encoded
    for item in iterable:
TypeError: 'Response' object is not iterable
127.0.0.1 - - [18/Feb/2021 13:34:58] "GET /download?action=20210216+16u11s19 HTTP/1.1" 200 -

Google 帮不上什么忙，我已经搜索了几个小时的错误原因。

Answer 1

试试

from flask import Flask, request
# set the project root directory as the static folder, you can set others.
app = Flask(__name__, static_url_path='')

@app.route('/download')
def download():
    return app.send_static_file('files.zip')