Socket.IO

https://socket.io/

Bidirectional and low-latency communication for every platform

It's like a wrapper of WebSocket, making WebSocket and realtime communication much easier.

Supported Languages

Many languages are supported for both server and client, as of the date of writing, here is a list of supported languages.

Client Implementations

There are also several client implementation in other languages, which are maintained by the community:

• Java: https://github.com/socketio/socket.io-client-java
• C++: https://github.com/socketio/socket.io-client-cpp
• Swift: https://github.com/socketio/socket.io-client-swift
• Dart: https://github.com/rikulo/socket.io-client-dart
• Python: https://github.com/miguelgrinberg/python-socketio
• .Net: https://github.com/doghappy/socket.io-client-csharp
• Rust: https://github.com/1c3t3a/rust-socketio

Server Implementations

• Golang: https://github.com/googollee/go-socket.io
• Golang: https://github.com/ambelovsky/gosf
• Java: https://github.com/mrniko/netty-socketio
• Java: https://github.com/trinopoty/socket.io-server-java
• Python: https://github.com/miguelgrinberg/python-socketio

Socket.io is designed for Nodejs natively, so only Nodejs has official server implementation,

Java, C++ and Swift clients are also officially supported to accomodate Android, Desktop and Apple apps.

Important Notes and Docs

• TypeScript Support
• Unit Testing
• Adapters for distributed systems
  • Replace in-memory adapter with database adapters when scaling to multiple Socket.IO servers
  • I've personally used Redis Adapter and it works fine
• Socket.IO Cheatsheet
• Concept of Room
  • Room concept allows users to
    • communicate with each other in a many to many way
    • broadcast to a group of users
    • etc.
  • It's an essential concept to understand
• Concept of Namespaces

  • A Namespace is a communication channel that allows you to split the logic of your application over a single shared connection

Admin UI

Socket.IO provides an admin UI for monitoring and debugging purposes.

Docs: https://socket.io/blog/admin-ui-first-release/

Go to this website to get connected. https://admin.socket.io

Note on CORS

Setting CORS to "*" may not work. you may have to set origin: ["https://admin.socket.io"].