var headers = new Headers()
 headers.set('x-sk-session-id', sessionId)
 headers.set('sessionid', sessionId)
  
   fetch('some-url', {
    method:      'POST',
    credentials: 'include',
    // withCredentials: true,
    // mode:        'same-origin',
    origin: 'some-api.url.com',
    referer: 'some-api.url.com',
    headers: headers,
  }).then((res)=> res.json()).then((data)=> console.log(data));