Tornado Catch allError Handler example

tornado_webapp.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#

import handlers as th
from tornado import web

class ErrorHandler(web.RequestHandler):
    """Generates an error response with status_code for all requests."""

    def write_error(self, status_code, **kwargs):
        print('In get_error_html. status_code: ', status_code)
        if status_code in [403, 404, 500, 503]:
            self.write('Error %s' % status_code)
        else:
            self.write('BOOM!')

    def prepare(self):
        print('In prepare...')
        raise Exception('Error!')

def application():

    handlers = [

        # Catch all Error handler
        (r"/", ErrorHandler),

        (r'/data', th.customHandler)
    ]

    settings = dict()
    return web.Application(handlers, **settings)