app.py

from tornado import httpserver, web, ioloop, options, log
from random import random

class BaseHandler(web.RequestHandler):
    '''BaseHandler for all handlers'''

    def write_error(self, status_code, **kwargs):
        if status_code == 400:
            response = {"code":status_code, "message": "Bad Request"}

        if status_code == 401:
            response = {"code":status_code, "message": "Unauthorized"}

        if status_code == 403:
            response = {"code":status_code, "message":"Forbidden"}

        if status_code == 404:
            response = {"code":status_code, "message":"Not Found"}

        if status_code == 405:
            response = {"code":status_code, "message":"Method Not Allowed"}

        if status_code == 408:
            response = {"code":status_code, "message":"Request Timeout"}

        if status_code == 500:
            response = {"code":status_code, "message":"Internal Server Error"}

        self.write({"response":response})

class IndexHandler(BaseHandler):
    '''Handles IndexHandler'''

    def get(self):
        # send_error() is used to test inherited write_error.
        # self.send_error(400)

        self.write({"response":\
                        {"code":200,"message":"OK","data":"Hello World "+str(random())}\
                   })

class ErrorHandler(BaseHandler):
    pass

class Application(web.Application):
    def __init__(self):
        handlers = [(r'/', IndexHandler), \
                    (r'/(.*)', ErrorHandler)]

        settings = {'autoreload':True, \
                    'compress_response':True}

        web.Application.__init__(self, handlers, **settings)

def main():
    options.options.log_file_prefix='/tmp/tornado_sample.log'
    log.enable_pretty_logging()
    webserver = httpserver.HTTPServer(Application()).listen(80,address='0.0.0.0')
    ioloop.IOLoop.instance().start()

if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        print "Stopping Webserver"

autoreload is same as debug. However to use only a few features of debug, you can switch autoreload to False and debug to True