tested websocket

src/Counter.tsx

@@ -11,18 +11,22 @@ export default class Counter extends React.Component {
     });
   };
 
-  decrement = () => {
-    this.setState({
-      count: (this.state.count - 1)
-    });
+  startConnection = () => {
+      const ws = new WebSocket("ws://localhost:5000");
+      ws.onopen = (event : Event)=>{
+          console.log("onopen");
+          ws.send("Messgage from client");
+      }
+      ws.onmessage = (event : MessageEvent) =>{
+          console.log(event.data);
+      }
   };
 
   render () {
     return (
       <div>
         <h1>{this.state.count}</h1>
-        <button onClick={this.increment}>Increment</button>
-        <button onClick={this.decrement}>Decrement</button>
+        <button onClick={this.startConnection}>Start Connection</button>
       </div>
     );
   }