https://medium.com/p/a7175417f9fd

saga.js

const updateTitleAPI = fetch(url, {
  method: 'PUT',
  headers: {
    'Accept': 'application/json',
    'Content-Type': 'application/json'
  },
  body: { title }
}).then(res => res.json());

const updateTitle = title => ({ type: UPDATE_TITLE, payload: title });

function* updateTitle({ payload }) {
  try {
    const json = yield call(updateTitleAPI, payload.title);
    yield put({ type: UPDATE_TITLE_SUCCESS, data: json });
    yield fork(fetchArticles);
  } catch(err) {
    yield put({ type: UPDATE_TITLE_FAILED });
  }
}
function* watchUpdateTitle() {
  yield takeLatest(UPDATE_TITLE, updateTitle);
}