Why proxy in ReactJS doesn't change url?

Question

JavaScript

Front on: localhost:3000
Back on: localhost:3001
In package.json: "proxy": " localhost:3001 ",

Network tab: the request goes to localhost:3000/news
And you need to 3001.
Code to send the request:

fetch("/news")
.then((res) => console.log(res)) // url: " localhost:3000/news "
.then((arr) => console.log(arr))
.catch ((err) => console.log(err));

React version: 18.0