如何将变量从中间件传递到falcon中的资源？

import falcon

class MyMiddleware:
    def process_request(self, req, resp):
        # 在中间件中设置变量
        req.context['my_variable'] = 'Hello, Falcon!'

class MyResource:
    def on_get(self, req, resp):
        # 在资源中获取变量
        my_variable = req.context['my_variable']
        resp.media = {'message': my_variable}

# 创建Falcon应用
app = falcon.App(middleware=[MyMiddleware()])

# 添加资源路由
app.add_route('/', MyResource())

# 运行应用
if __name__ == '__main__':
    from wsgiref import simple_server
    httpd = simple_server.make_server('localhost', 8000, app)
    httpd.serve_forever()