Your backend server is spring server
You need to allow the origin for the websockets:
registry.addEndpoint("/gs-guide-websocket").setAllowedOrigins("https://sophienzentrum.org");
Your backend server is spring server
You need to allow the origin for the websockets:
registry.addEndpoint("/gs-guide-websocket").setAllowedOrigins("https://sophienzentrum.org");