> For the complete documentation index, see [llms.txt](https://openai.gitbook.io/code-cheatsheets/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://openai.gitbook.io/code-cheatsheets/all/cs_fundamentals/real-time.md).

# Real-Time

How do you do stuff like realtime updates, push changes from server to clients?

## Websockets

[Sockets.io](https://socket.io/)

* Create a sustained connection that both sides listen to
* Remove work of constantly doing a handshake, creating a connection, and sending headers

### Polling

Client requests updates from server on schedule

### Long polling / Server-Sent Events

The client asks for info and the server keeps the connection open until a response, uses the EventSource API

## Kafka

Heavy duty producer consumer relationship

All these producers publish to kafka to their own or a common stream, and all these consumers can subscribe to the data streams