You can access the chat app by going to http://localhost:8080/chat in your web browser.

To join a chat room, append the room query parameter to the URL. For example, to join a chat room with ID test, go to http://localhost:8080/chat?room=test.

To send a message to the chat room, type your message in the input field at the bottom of the chat window and press Enter. Your message will be broadcast to all users in the chat room.

You can also send messages programmatically using the WebSocket API. To do this, you need to open a WebSocket connection to the chat app server and send JSON messages with the following format:

{
  "username": "Cristian",
  "text": "Hello, world!"
}

Replace Alice with your username and Hello, world! with your message text.

You can use the following curl command to send a message to the chat room:

curl -X POST -H "Content-Type: application/json" -d '{"username":"your_username","text":"your_message"}' http://localhost:8080/message?room=your_room_id

To open a WebSocket connection, send an HTTP GET request to the /ws endpoint with the room query parameter. For example, to join a chat room with ID test, run the following command in your terminal:

curl -i -N -H "Connection: Upgrade" -H "Upgrade: websocket" -H "Sec-WebSocket-Version: 13" -H "Sec-WebSocket-Key: SGVsbG8sIHdvcmxkIQ==" http://localhost:8080/ws?room=test

Replace the test with the ID of the chat room you want to join.

The output should look like this:

HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=