Nodejs } Problem in connecting with localhost : Error 404

I am trying to start a file server under node.js using the following command on my terminal :

$ npx serve -p 5050 static

Above command works and generate a display box on terminal.

Example like the following :

But it doesn't work and generate 404 error after I copy and paste "http://localhost:5050" on safari address bar.

Following method tried :

• turn off of firewall -> Doesn't work
• change code to "$ npx serve -p 3000 static" on terminal --> Doesn't work

Is there anyone whom knows what goes wrong?