I'm sorry but I cannot, in my right mind, recommend anyone ever use Tornado. Not least because python now natively supports async/await. There was a thing.. an unholy union of threads, sleeps, and tornado.gen co-routines. It would always break. How could it not when mixing every concurrency paradigm imaginable. When it did everything started burning. Data stopped flowing. Many an engineer tried and failed to fix it. Have you ever seen three TLS client hellos on the same TCP connection? I have. Tornado is actually the most accurate name you can give the framework: a big whirling mess. Maybe I'm being too hard on tornado, but I kinda blame tornado for introducing co-routines before python was ready for it. The company has since moved on to golang, but the tornado is still whirling and will be for years to come.