echo.py

import tornado.ioloop
import tornado.web
import pprint

class Echo(tornado.web.RequestHandler):
    def get(self, *args, **kw):
        data = self.request.__dict__.copy()
        data.pop('server_connection')
        data.pop('connection')
        data['headers'] = dict(data['headers'])
        self.write(pprint.pformat(data, indent=2))

if __name__ == '__main__':
    app = tornado.web.Application([(r'/.'", Echo)])
    app.listen(8888)
    tornado.ioloop.IOLoop.current().start()