Is there possible implement websocket using AT Command? For example I have a sim800l module to communicate to a server using websocket (socket.io) but that module allows AT Command to operate.

I have successfully made an HTTP request, but I don't know how to make a request via WebSocket using AT Command.

thank you.
Yes, you can @Imanuel. You just need to establish a Simple TCP connection and then send the HTTP headers for upgrading the normal HTTP connection to WebSockets.