鸟瞰tornado Web framework tornado.web — RequestHandler and Application classes tornado.template — Flexible output generation tornado.routing — Basic routing implementation tornado.escape — Escaping and string manipulation tornado.locale — Internationalization support tornado.websocket — Bidirectional communication to the browser HTTP servers and clients tornado.httpserver — Non-blocking HTTP server tornado.httpclient — Asynchronous HTTP client tornado.httputil — Manipulate HTTP headers and URLs tornado.http1connection – HTTP/1.x client/server implementation