reading-notes

🗒️ Class 12 Socket.io

Readings

Web Sockets

• What is a Web Socket?

  A web socket is an interaction between a web browser and a web server transferring realtime data.

• Describe the Web Socket request/response handshake and what happens once the connection is established.

  A handshake starts with a request from a client and a response from the server. Once extablised, the communication between the client and the server switches to a bidirectional protocol.

• Web Sockets provide a standardized way for the server to send content to a client without first receiving a __ from that client.

  Request

Socket.io Tutorial

• What does the event handler io.on() do?

  It handles the connection, disconnection, and other events in the socket object.

• Describe some possible proof of life or proof that the code works as expected

  answer

• What does socket.emit() do?

  It creates and fire custom events.

Socket.io vs Web Sockets

• What is the difference between WebSocket and Socket.IO? (think Git and GitHub, or OAuth and Auth0).

  WebSocket is a communication protocol and Socket.IO is a library that uses WebSocket and provides an interface.

• When would you use Socket.IO?

  When we need to provide event-based communication between browser and server that supports broadcasting and can be estrablised with proxies and load balancers.

• When would you use WebSockets?

  Whe we want the full duplex connection over TCP.

Videos

OSI Model

• What are a couple of key takeaways from this video?

TCP Handshakes

• Translate the gist of this video to a non-technical friend