Tornado (web server)

Tornado is a scalable, non-blocking web server and web application framework written in Python.^[2] It was developed for use by FriendFeed; the company was acquired by Facebook in 2009 and Tornado was open-sourced soon after.^[3]

Tornado

Original author(s)	FriendFeed
Developer(s)	Ben Darnell, Meta, Bret Taylor
Initial release	2009; 14 years ago (2009)
Stable release	6.2.0^[1]  / 3 July 2022; 6 months ago (3 July 2022)
Repository	Tornado Repository
Written in	Python
Operating system	Cross-platform
Available in	English
Type	Web server
License	Apache licence 2.0
Website	www.tornadoweb.org

Performance

Tornado is noted for its high performance. Its design enables handling a large number of concurrent connections (i.e., tries to solve the "C10k problem").

Modules

• An asynchronous MongoDB driver called Motor.
• CouchDB drivers called corduroy and trombi.
• Asynchronous driver for PostgreSQL wrapping psycopg called Momoko

Example

The following code shows a simple web application that displays "Hello World!" when visited:^[4]

import asyncio import tornado.web 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()) 

See also

•  Free and open-source software portal

• Django (web framework)
• FastAPI
• Flask (web framework)
• Pylons project
• Web2py
• Comparison of web server software

References

1. "Release v6.2.0: What's new in Tornado 6.2.0".
2. "Home - tornado - GitHub". GitHub. Retrieved 2009-09-10.
3. "Facebook open-sources real-time FriendFeed facet". CNet. Retrieved 2009-09-10.
4. "Hello, world". Retrieved 2022-09-14.

External links

• Official website