title: ReactJs No Authorization Header is present
body: <p>I am trying to get json data returned from my api call using reactjs. 
  1. I tried running url with valid bearer token on fiddler and it gave me correct results.
  2. I tried using same url in below fetch call and used the same fiddler generated bearer token in react code.</p>
  
  <p>It throws 401 unauthorized error.</p>
  
  <p>I compared point 1 and point 2 fiddler requests under tab AUTH. One has correct bearer token but 2nd one i.e react code says "No Authorization Header is present". I am sending Token in react code but why it says "No Authorization Header is present"   </p>
  
  <pre><code>componentDidMount () {
    const url = 'my reallyworking api url on fiddler';
    fetch(url
      , {
        method: 'POST',
        crossDomain: true,
        mode: 'no-cors',
        headers: new Headers({
          'Authorization': 'Bearer ' + 'token generated from fiddler after running auth',
          'Accept': 'application/json',
          'Content-Type': 'application/json'
        })
      }
    )
      .then(res =&gt; res.json())
      .then(
        (result) =&gt; {
          alert('success');
          this.setState({
            isLoaded: true,
            gridData: result.items
          });
        },
        (error) =&gt; {
          this.setState({
            isLoaded: true,
            error
          });
        }
      );
  }
  </code></pre>
  
  <p>Fiddler is not showing any Headers. Below is my fiddler tracking</p>
  
  <pre><code>POST https://myurl HTTP/1.1
  Host: myHost
  Connection: keep-alive
  Content-Length: 0
  accept: application/json
  Origin: https://localhost:xyz
  User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36
  Referer: https://localhost:xyz/testfetch
  Accept-Encoding: gzip, deflate, br
  Accept-Language: en-US,en;q=0.9
  </code></pre>
  
  <p>Note: 
  1. I created a headers object headers: new Headers({'content-type': 'application/json'}),as explained <a href="https://stackoverflow.com/questions/38156239">here</a>
  2. I am not using isomorphic fetch as explained <a href="https://stackoverflow.com/questions/38156239">here</a></p>