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Tornado Web Server

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Tornado <http://www.tornadoweb.org>_ is a Python web framework and
asynchronous networking library, originally developed at FriendFeed <http://friendfeed.com>. By using non-blocking network I/O, Tornado
can scale to tens of thousands of open connections, making it ideal for
long polling <http://en.wikipedia.org/wiki/Push_technology#Long_Polling>,
WebSockets <http://en.wikipedia.org/wiki/WebSocket>_, and other
applications that require a long-lived connection to each user.

Hello, world

Here is a simple "Hello, world" example web app for Tornado:

.. code-block:: python

import asyncio
import tornado

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        self.write("Hello, world")

def make_app():
    return tornado.web.Application([
        (r"/", MainHandler),
    ])

async def main():
    app = make_app()
    app.listen(8888)
    await asyncio.Event().wait()

if __name__ == "__main__":
    asyncio.run(main())

This example does not use any of Tornado's asynchronous features; for
that see this simple chat room <https://github.com/tornadoweb/tornado/tree/stable/demos/chat>_.

Documentation

Documentation and links to additional resources are available at
https://www.tornadoweb.org

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