Silently closing websockets in Tornado

Question

I have an nginx-server with one-hour timeout and a Tornado web-server behind it.

When nginx closes the connection, I have no idea about it in Tornado. I saw this question about closing connections automatically by timeout-event (Implementing and testing WebSocket server connection timeout) and I'm going to use it as a fallback workaround.

My question is: does the Tornado have an internal mechanism for websocket connections invalidation?

Answer 1

WebSocketHandler has an overridable on_close method, which should be getting called when the connection is closed (most of the time). This method is not 100% reliable (due to the limitations of the underlying network protocols), however, so a timeout-based fallback is recommended. Tornado doesn't have any built-in support for this, though, so you'll have to implement it yourself, perhaps in a manner similar to the answer you linked to.