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Turns out the CORS is always enabled for WebSocket with SockJS. So, since we cannot predict an URL for the `index.html` therefore we always recommend open it on the same host port as server application - `http://localhost:8080`
WebSockets Sample
This example demonstrates the Standard WebSocket protocol (without any sub-protocols) with Spring Integration Adapters. It just sends current time from the server to all connected clients.
Server
The server is presented only with a single org.springframework.integration.samples.websocket.standard.server.Application
class, which is based on the Spring Boot AutoConfiguration and Spring Integration Java & Annotation configuration.
It is a main and starts an embedded Tomcat server on the default 8080 port. The WebSocket endpoint is mapped to the /time path.
The server also can be run from Gradle gradlew :web-sockets:run
Java Client
The org.springframework.integration.samples.websocket.standard.client.Application is a simple Java application,
which starts an integration flow (client-context.xml), connects to the WebSocket server and prints Messages to the
logs, which are received over WebSocket.
Browser Client
The index.html in the src/main/resources/static directory of this project demonstrates a JavaScript SockJS client, which connects
to our server and just prints its messages in the middle of page. It can be reached at http://localhost:8080/index.html.
Test Case
The org.springframework.integration.samples.websocket.standard.ApplicationTests demonstrates the Spring Boot test
framework and starts Server & Client to check, that the client receives correct data.