Sse

SSE - Server Side Events

http://flask.pocoo.org/snippets/116/

https://github.com/stevenewey/ssedemo

for node

https://tomkersten.com/articles/server-sent-events-with-node/

http://www.futureinsights.com/home/real-time-the-easy-way-with-eventsource-angularjs-and-nodejs.html