WebSocket

TCP上で双方向通信を行うためのプロトコル

HTTPと同様、OSI参照モデルで言うところのアプリケーション層に対応する

JavaScriptクライアント

code:js

const socket = new WebSocket('ws://localhost:8888');

socket.addEventListener('open', (event) => console.log('open', event));

socket.addEventListener('error', (event) => console.log('error', event));

socket.addEventListener('close', (event) => console.log('close', event));

// receive

socket.addEventListener('message', (event) => {

console.log('message', event);

});

// send

socket.send('Hello');

// close

socket.close();