Adding the missing return.

main.go

@@ -224,13 +224,14 @@ func clientHandler(w http.ResponseWriter, r *http.Request) {
 		select {
 		case <-r.Context().Done():
 			fmt.Printf("Connection to client %s closed. Cleanup the channel.\n", remote)
+			return
 		default:
 		}
 		chunk := <-ch.Data
 		_, err := w.Write(chunk)
 		if err != nil {
 			fmt.Printf("Write to remote client %s failed, closing...\n", remote)
-			break
+			return
 		}
 	}
 }