The document discusses various techniques for enabling real-time communication between web browsers and servers, including periodic polling, Comet with streaming and long polling, implementations like Bayeux and Orbited, webhooks, XMPP, BOSH, and HTML5 WebSockets. Real-time web allows for event-driven interactions and live updates by overcoming limitations of traditional HTTP requests and responses.

1. Realtime Web
(Useful Paradigm)
http://usefulparadigm.com

2. HTTP + Realtime = ?

3. Periodic Refresh
(Ajax Polling)
Broswer Server
request
response
Event (state change)
request
response
request
response

4. Comet (Streaming)
Broswer Server
request
Event (state change)
response(part)
Event (state change)
response(part)

5. Comet (Long Polling)
Broswer Server
request
response
request
response Event (state change)
request
response

6. Comet
Implementations
Bayeux
* : Comet Maturity Guide (http://cometdaily.com/maturity.html)

7. An Integration Example
Web App. Framework STOMP
Orbited MQ
(like Rails, Django ..)
HTTP Comet
(TCPSocket)
Browser

8. WebHook
Broswer Server
request Event (state change)
POST
Callback
* cf. PubSubHubbub: http://code.google.com/p/pubsubhubbub/

9. XMPP
• Message stanza
• Presense stanza
• IQ stanza

11. BOSH
(Bidirectional-streams Over Synchronous HTTP)

12. Juggernaut
(http://juggernaut.rubyforge.org/)
flash
object
push
server

13. Long long time ago..

14. Return of the Socket
HTML5 WebSocket
* : http://www.flickr.com/photos/54873020@N00/3179059081/