WebSocket

<!-- Spring WebSocket -->
      <!-- https://mvnrepository.com/artifact/org.springframework/spring-websocket -->
      <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-websocket</artifactId>
         <version>${org.springframework-version}</version>
      </dependency>


      <!-- jackson bind -->
      <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
      <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-databind</artifactId>
         <version>2.9.8</version>
      </dependency>

	<!-- https://github.com/sockjs/sockjs-client -->
	<script src="https://cdn.jsdelivr.net/npm/sockjs-client@1/dist/sockjs.min.js"></script>
	<script>