我在使用 authkit 和 pylons 设置对 openID 身份验证的支持时遇到了麻烦。我按照食谱中的描述设置了所有内容，但仍然出现以下错误：
File "/usr/lib/python2.6/dist-packages/authkit/authenticate/open_id.py", line 480, in __call__
return self.app(environ, start_response)
File "/usr/lib/python2.6/dist-packages/authkit/authenticate/open_id.py", line 218, in __call__
self.session_middleware
AuthKitConfigError: The session middleware 'beaker.session' is not present. Have you set up the session middleware?
（完整的回溯是非常无信息的，只是一个中间件调用链）
我的配置如下：
authkit.setup.method = openid, cookie
# TODO authkit.openid.template.file =
authkit.cookie.params.httponly = true
authkit.openid.store.type = file
authkit.openid.store.config = %(here)s/data
authkit.openid.session.middleware = beaker.session
authkit.openid.session.key = authkit_openid
authkit.openid.baseurl = http://mysite.moc
authkit.openid.path.signedin = /main/cabinet
authkit.openid.authenticate.user.encrypt = authkit.users:md5
烧杯中间件肯定已加载，这是我的 make_app 函数（是的，pylons 版本检查是真的）：
| # Configure the Pylons environment
| load_environment(global_conf, app_conf)
|
| # The Pylons WSGI app
| app = PylonsApp()
| app = UserMiddleware(app)
|
| if pylons.__version__ >= "0.9.7":
|- from beaker.middleware import SessionMiddleware
|| from routes.middleware import RoutesMiddleware
|| app = RoutesMiddleware(app, config['routes.map'])
|| app = SessionMiddleware(app, app_conf)
|
|
| if asbool(full_stack):
| # Handle Python exceptions
|
|- app = authkit.authenticate.middleware(app, app_conf)
|| # Display error documents for 401, 403, 404 status codes (and
|| # 500 when debug is disabled)
|| if pylons.__version__ >= "0.9.7":
||- app = ErrorHandler(app, global_conf,
23- **config['pylons.errorware'])
||| from pylons.middleware import StatusCodeRedirect
||| if asbool(config['debug']):
23- app = StatusCodeRedirect(app)
||| else:
23- app = StatusCodeRedirect(app, [401, 403, 404, 500])
|| else:
||- app = ErrorHandler(app, global_conf, error_template = error_template,
23- **config['pylons.errorware'])
||| app = ErrorDocuments(app, global_conf, mapper=error_mapper, **app_conf)
|
| # Establish the Registry for this application
| app = RegistryManager(app)
|
| # Static files
| javascripts_app = StaticJavascripts()
| static_app = StaticURLParser(config['pylons.paths']['static_files'])
| app = Cascade([static_app, javascripts_app, app])
| return app
有谁知道，这里发生了什么？