域转发到PythonAnywhere后，Flask会话为空，仅在Safari (webkit)中

from flask import Flask, session

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your_secret_key'

@app.route('/')
def index():
    session['key'] = 'value'  # 设置会话数据
    return 'Hello World'

if __name__ == '__main__':
    app.run()

from flask import make_response

@app.route('/api')
def api():
    response = make_response('API response')
    response.headers['Access-Control-Allow-Origin'] = 'http://yourdomain.com'  # 允许跨域请求的域名
    response.headers['Access-Control-Allow-Credentials'] = 'true'  # 允许携带cookie
    return response