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You can leave the web server running while you develop your application. The web server watches for changes in your source files and reloads them if necessary. Try for example:

  1. Leave the web server running (in a console window).

  2. Go to and keep http://localhost:3000/ loaded in your browser.

  3. Edit main/templates/welcome.html and change Hello, world! to something else.

  4. When you save, you should see the change automatically reloading in the browser.