title: Fetch API cannot load the url. Response for preflight is invalid (redirect)
body: <p>I use fetch to call a post service and I get the error <code>Fetch API cannot load http://localhost:8080/user/login</code>. Response for preflight is invalid (redirect)'. <code>Status code: 302 Found.</code> The variable 'data' is a json <code>object {email: "batman@dc.com", password: "111"}</code></p>
  
  <pre><code>   fetch('http://localhost:8080/user/login', {
          method: 'post',
          body : JSON.stringify(data),
          headers: {
              'Accept': 'application/json',
              'Content-Type': 'application/json'
          },
          dataType : 'json'
      })
  </code></pre>