It's headless by default (but it starts a web browser going to localhost:8080 by default too). If you don't have a web browser, it won't open it. If you don't

It's headless by default (but it starts a web browser going to localhost:8080 by default too). If you don't have a web browser, it won't open it. If you don't want it to open a web browser, you can configure that.