Doing a (GET) fetch request

class HelloMessage extends React.Component {
  const [state, setState] = useState()
  useEffect(()=> {
     fetch(your_url)
    .then(res => res.json())
    .then(data => {
      setState({your_state:data})
    })
  }, [])
  render() {
    return <div>Hello</div>
  }
}

ReactDOM.render(
  <HelloMessage />,
  document.getElementById('hello-example'),
)

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