2012 10-05 socketio

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The document introduces traditional web interactions that rely on request-response patterns compared to more modern and dynamic interactions enabled by websockets. It discusses how websockets allow for real-time communication through continuous connections and bidirectional messaging. Code examples are provided to demonstrate how socket.io can be used with Node.js to implement websockets and provide fallback options for browser support, establishing connections, and handling network issues.

Technology

An Introduction to...

by Dan Schultz (@slifty)

TRADITIONAL WEB
INTERACTIONS

Request

Response

FOR INSTANCE....
Client Says Server Responds

Show me the front page of
the NY Times
Sure thing, enjoy reading
glorious journalism!”

Do I have any new emails?
Here are your 423 new emails
you popular netizen

I DEMAND ANIMATED GIFS
You got it, boss, I proudly
present Obama slicing a salami
with his hands

HOW WOULD YOU SAY...

Let me know when...

This is awkward.

Keep me updated with... I was kind of thinking our
relationship would be a “one
time” deal.

Push me a notice if...

POLLING
The Younger Sibling
Approach

Do you have any new tweets? How bout now?

What about now?

I don’t know if you knew
this, but I’m looking for new
tweets
I’m betting there are some
now.
New tweets?
You’ll never guess what I’m
about to ask for. Holy crap. I’m gonna go shut
down now.

It’s been like 10 seconds you
have to have some by now.

WEBSOCKET INTERACTION

Handshake

Messages

WHY? REAL TIME

• Live transcripts

• Active content streams

• Chat rooms

• Games

• Etc.

BUT WAIT...

Browser support?

Network problems?

Heartbeats?

Stateless servers?

What this code does...
1) Starts the server
2) Sets code to run for all new connections.
The passed socket is a portal to the client.
3) Sends a “greeting” event to the new client.
4) Listens to the socket for insults.
5) Whenever an insult arrives, outputs it
to the console.

What this code does...

1) Loads socket.io from the server
2) Creates a new socket, connected to
the server on “http://localhost”
3) Listens to the socket for greetings
4) Whenever a greeting arrives,
outputs it and responds with a nasty
insult.

MORE INFORMATION

nodejs.org

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2012 10-05 socketio

1. An Introduction to... by Dan Schultz (@slifty)

2. TRADITIONAL WEB INTERACTIONS Request Response

3. FOR INSTANCE.... Client Says Server Responds Show me the front page of the NY Times Sure thing, enjoy reading glorious journalism!” Do I have any new emails? Here are your 423 new emails you popular netizen I DEMAND ANIMATED GIFS You got it, boss, I proudly present Obama slicing a salami with his hands

4. HOW WOULD YOU SAY... Let me know when... This is awkward. Keep me updated with... I was kind of thinking our relationship would be a “one time” deal. Push me a notice if...

5. THIS IS LIMITING

6. POLLING The Younger Sibling Approach Do you have any new tweets? How bout now? What about now? I don’t know if you knew this, but I’m looking for new tweets I’m betting there are some now. New tweets? You’ll never guess what I’m about to ask for. Holy crap. I’m gonna go shut down now. It’s been like 10 seconds you have to have some by now.

7. WEBSOCKETS

8. WEBSOCKET INTERACTION Handshake Messages

9. WHY? REAL TIME • Live transcripts • Active content streams • Chat rooms • Games • Etc.

10. BUT WAIT... Browser support? Network problems? Heartbeats? Stateless servers?

11. SOCKET.IO + NODE.JS

12. FALLBACK PLAN

13. What this code does... 1) Starts the server 2) Sets code to run for all new connections. The passed socket is a portal to the client. 3) Sends a “greeting” event to the new client. 4) Listens to the socket for insults. 5) Whenever an insult arrives, outputs it to the console. What this code does... 1) Loads socket.io from the server 2) Creates a new socket, connected to the server on “http://localhost” 3) Listens to the socket for greetings 4) Whenever a greeting arrives, outputs it and responds with a nasty insult.

14. MORE INFORMATION nodejs.org socket.io stackoverﬂow.com

15. @slifty

2012 10-05 socketio

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