Failed to load https://api.twitter.com/1.1/statuses/user_timeline.json?screen_name=reactjs: Response for preflight has invalid HTTP status code 400.

import React, { Component } from 'react';
import Twitter from 'twitter';
import { twitterConfig } from './twitter-config.js';
import logo from './logo.svg';
import './App.css';

class App extends Component {
  constructor(){
    super();
    this.Client = new Twitter(twitterConfig);
    this.searchTwitter = this.searchTwitter();
  }

  searchTwitter(){
    this.Client.get('statuses/user_timeline', {screen_name: 'reactjs'}, function(error, tweets, response) {
      if (!error) {
        console.log(tweets);
      } else {
        console.log(error);
      }

    });
  }

  render() {
    return (
      <div className="App">
        <header className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h1 className="App-title">Welcome to React</h1>
        </header>
        <p className="App-intro">
          this.searchTwitter
        </p>
      </div>
    );
  }
}

export default App;

export const twitterConfig = {
  consumer_key: '...',
  consumer_secret: '...',
  access_token_key: '...',
  access_token_secret: '...'
};