Socket IO Real Time Applications

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This document summarizes a meetup about using Socket.IO for real-time applications. It discusses limitations of traditional HTTP requests/responses for real-time applications and solutions like long polling, streaming, and websockets. It notes that websockets are ideal but have limitations for older proxies and firewalls. Socket.IO provides an abstraction layer to use the best transport, including websockets, long polling, and streaming. The meetup will demonstrate Socket.IO through examples and code.

Technologie

Meetup 2
Socket IO Real Time Applications

Who Are We
Eddy
@eddydkim
eddy@drumbi.com
Farsheed
@captainatef
farsheed@drumbi.com

Overview
Last Meetup Recap
Why Node JS
Javascript Intro
Today
Realtime Web Application Aches
Socket IO Cure
Examples

Real Time Web Applications
Pretty Moving Graphs
Feeds (Twitter, News, etc.)
Chatrooms
Html5 Multiplayer Games

Limitations of HTML
HTML Designed for Request/Response
1. Browser -> Server
2. Server -> Browser
3. Repeat

Solutions
HTML Protocol Hacks:
● Short Polling
● Long Polling
○ <script>
○ AJAX Long Polling
● Streaming
○ XMLHttpRequest Multipart Chunks
○ Forever Iframe

Problems with Hacks
● HTTP Overhead for many small updates
● Resource Waste in opening and closing
connections
● Latency Overhead
● Different Implementations for Each Browser

WebSockets To Rescue!
● Full Web Standard
designed for two way
communication
● Minimal Overhead for each
message
● Most Modern Browsers
Support it

WebSocket Limitations
● HTTP Upgrade
Handshake Breaks some
older Proxies
● Many Gateways, Load
Balancers, Reverse
Proxies Servers dont
support websocket
● Some Firewalls block
Websockets

Socket IO Got You Covered
Socket IO Real Time
Communication Library for both
server and client
● Abstract Layer over Multiple
Transports
○ Long Polling
○ Streaming
○ Websockets
○ Flashsockets (BLEH)
● Auto Reconnect, Heartbeats,
Auto Chooses Best Transport

Other Good Alternatives
● socksjs
● nowjs
● engine.io (socket.io but naked)

How to Get Started
1. express example
2. enter example folder
3. npm install socket.io --save
Farsheedius Shall walk through the rest
For the impatient: echo example
https://github.com/eddify/socketio-starter

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Socket IO Real Time Applications

1. Meetup 2 Socket IO Real Time Applications

2. WIFI

3. Who Are We Eddy @eddydkim eddy@drumbi.com Farsheed @captainatef farsheed@drumbi.com

4. Overview Last Meetup Recap Why Node JS Javascript Intro Today Realtime Web Application Aches Socket IO Cure Examples

5. Real Time Web Applications Pretty Moving Graphs Feeds (Twitter, News, etc.) Chatrooms Html5 Multiplayer Games

6. Limitations of HTML HTML Designed for Request/Response 1. Browser -> Server 2. Server -> Browser 3. Repeat

7. Solutions HTML Protocol Hacks: ● Short Polling ● Long Polling ○ <script> ○ AJAX Long Polling ● Streaming ○ XMLHttpRequest Multipart Chunks ○ Forever Iframe

8. Problems with Hacks ● HTTP Overhead for many small updates ● Resource Waste in opening and closing connections ● Latency Overhead ● Different Implementations for Each Browser

9. WebSockets To Rescue! ● Full Web Standard designed for two way communication ● Minimal Overhead for each message ● Most Modern Browsers Support it

10. WebSocket Limitations ● HTTP Upgrade Handshake Breaks some older Proxies ● Many Gateways, Load Balancers, Reverse Proxies Servers dont support websocket ● Some Firewalls block Websockets

11. Socket IO Got You Covered Socket IO Real Time Communication Library for both server and client ● Abstract Layer over Multiple Transports ○ Long Polling ○ Streaming ○ Websockets ○ Flashsockets (BLEH) ● Auto Reconnect, Heartbeats, Auto Chooses Best Transport

12. Other Good Alternatives ● socksjs ● nowjs ● engine.io (socket.io but naked)

13. How to Get Started 1. express example 2. enter example folder 3. npm install socket.io --save Farsheedius Shall walk through the rest For the impatient: echo example https://github.com/eddify/socketio-starter

Socket IO Real Time Applications

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