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// fake online web API: https://jsonplaceholder.typicode.com/

const createRequest = function(url){
  const httpRequest = new XMLHttpRequest(url);
  httpRequest.addEventListener('readystatechange', (url) => {
    if(httpRequest.readyState === 4){
      console.log(httpRequest.responseText); // output response
    }
  });
  httpRequest.open('GET', url);
  httpRequest.send();
};

createRequest('https://jsonplaceholder.typicode.com/todos/1');