You'll need to run the server (https://github.com/nashjain/java-legacy-chat-server) locally and then update the code with your local IP address. How to run server: download and double click on target/chat-server.jar or java -jar target/chat-server.jar API example: http://localhost:4567/send?message=Yo_this_is_a_message&senderName=naresh http://localhost:4567/fetchAllMessages