tornado

Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, 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:

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.

Documentation

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

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- Sigstore integration time: Aug 7, 2026
Source repository:
- Permalink: tornadoweb/tornado@a55abe3e3bf59994f29b2f7084c46341f0d4f6a7
- Branch / Tag: refs/tags/v6.5.8
- Owner: https://github.com/tornadoweb
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: build.yml@a55abe3e3bf59994f29b2f7084c46341f0d4f6a7
- Trigger Event: push

Release history Release notifications | RSS feed

This release

6.5.8

Aug 7, 2026

6.5.7

Jun 8, 2026

6.5.6

May 27, 2026

6.5.5

Mar 10, 2026

6.5.4

Dec 15, 2025

6.5.3

Dec 11, 2025

6.5.2

Aug 8, 2025

6.5.1

May 22, 2025

6.5

May 15, 2025

6.5b1 pre-release

Apr 30, 2025

6.4.2

Nov 22, 2024

6.4.1

Jun 6, 2024

6.4

Nov 29, 2023

6.4b1 pre-release

Nov 16, 2023

6.3.3

Aug 11, 2023

6.3.2

May 14, 2023

6.3.1

Apr 21, 2023

6.3

Apr 18, 2023

6.3b1 pre-release

Apr 9, 2023

6.2

Jul 3, 2022

6.2b2 pre-release

Jun 18, 2022

6.2b1 pre-release

Jun 11, 2022

6.1

Oct 30, 2020

6.1b2 pre-release

Oct 25, 2020

6.1b1 pre-release

Sep 30, 2020

6.0.4

Mar 4, 2020

6.0.3

Jun 23, 2019

6.0.2

Mar 23, 2019

6.0.1

Mar 3, 2019

6.0

Mar 1, 2019

6.0b1 pre-release

Feb 10, 2019

6.0a1 pre-release

Jan 2, 2019

5.1.1

Sep 16, 2018

5.1

Jul 11, 2018

5.1b1 pre-release

Jun 11, 2018

5.0.2

Apr 8, 2018

5.0.1

Mar 18, 2018

5.0

Mar 5, 2018

5.0b1 pre-release

Jan 27, 2018

5.0a1 pre-release

Dec 27, 2017

4.5.3

Jan 6, 2018

4.5.2

Aug 27, 2017

4.5.1

Apr 20, 2017

4.5

Apr 16, 2017

4.5b2 pre-release

Apr 11, 2017

4.5b1 pre-release

Mar 26, 2017

4.4.3

Mar 30, 2017

4.4.2

Sep 30, 2016

4.4.1

Jul 23, 2016

4.4

Jul 15, 2016

4.4b1 pre-release

Jul 8, 2016

4.3

Nov 6, 2015

4.3b2 pre-release

Oct 24, 2015

4.3b1 pre-release

Oct 18, 2015

4.2.1

Jul 17, 2015

4.2

May 27, 2015

4.2b1 pre-release

May 10, 2015

4.1

Feb 7, 2015

4.1b2 pre-release

Feb 1, 2015

4.0.2

Sep 11, 2014

4.0.1

Aug 12, 2014

4.0

Jul 15, 2014

3.2.2

Jun 4, 2014

3.2.1

May 6, 2014

3.2

Jan 14, 2014

3.1.1

Sep 1, 2013

3.1

Jun 15, 2013

3.0.2

Jun 2, 2013

3.0.1

Apr 9, 2013

3.0

Mar 29, 2013

2.4.1

Nov 25, 2012

2.4

Sep 4, 2012

2.3

Jun 1, 2012

2.2.1

Apr 24, 2012

2.2

Jan 30, 2012

2.1.1

Oct 4, 2011

2.1

Sep 21, 2011

2.0

Jun 22, 2011

1.2.1

Mar 3, 2011

1.2

Feb 20, 2011

1.1.1

Feb 9, 2011

1.1

Sep 9, 2010

1.0

Jul 23, 2010

0.2

May 18, 2010

tornado 6.5.8

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