Redux async requests with fetch api

I'm stuck in a wierd behaviour that I can't really debug.

The store dispatch the action that perform the login request passing username and password. Then when the response is ready I store the credentials in the redux store. When I need to perform an authorized request I set those parameters in the header request. When I receive the response I update the credentials in the store with the new ones that I get from the response. When I try to perform the third request it will respond unauthorized. I figured out that this is because all the parameters passed to my action generator setCredentials are null. I can't understand why also because if I add a debugger before the return statement of my setCredentials function and I wait some seconds before restart the execution I found out that the parameters aren't null anymore. I was thinking about the fact that the request is async but being inside a then statement the response should be ready right? I've also notice that fetch sent two request for each one. Here the code for more clarity.

import { combineReducers } from 'redux'
import { createStore, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';

const initialState = {
  currentUser: {
    credentials: {},
    user: {}
  },
  test: {},
  users: []
}

export const SUBMIT_LOGIN = 'SUBMIT_LOGIN'
export const SET_USER = 'SET_USER'
export const TEST = 'TEST'
export const SET_USERS = 'SET_USERS'
export const SET_CREDENTIALS = 'SET_CREDENTIALS'

//actions
const submitLogin = () => (dispatch) => {
  return postLoginRequest()
    .then(response => {
      dispatch(setCredentials(
        response.headers.get('access-token'),
        response.headers.get('client'),
        response.headers.get('expiry'),
        response.headers.get('token-type'),
        response.headers.get('uid')
      ));
      return response
    })
    .then(response => {
      return response.json();
    })
    .then(
      (user) => dispatch(setUser(user.data)),
    );
}

const performRequest = (api) => (dispatch) => {
  return api()
    .then(response => {
      dispatch(setCredentials(
        response.headers.get('access-token'),
        response.headers.get('client'),
        response.headers.get('expiry'),
        response.headers.get('token-type'),
        response.headers.get('uid')
      ));
      return response
    })
    .then(response => {return response.json()})
    .then(
      (users) => {
        dispatch(setUsers(users.data))
      },
    );
}

const setUsers = (users) => {
  return {
    type: SET_USERS,
    users
  }
}

const setUser = (user) => {
  return {
    type: SET_USER,
    user
  }
}

const setCredentials = (
  access_token,
  client,
  expiry,
  token_type,
  uid
) => {
  debugger
  return {
    type: SET_CREDENTIALS,
    credentials: {
      'access-token': access_token,
      client,
      expiry,
      'token-type': token_type,
      uid
    }
  }
}

//////////////
const currentUserInitialState = {
  credentials: {},
  user: {}
}

const currentUser = (state = currentUserInitialState, action) => {
  switch (action.type) {
    case SET_USER:
      return Object.assign({}, state, {user: action.user})
    case SET_CREDENTIALS:
      return Object.assign({}, state, {credentials: action.credentials})
    default:
      return state
  }
}

const rootReducer = combineReducers({
  currentUser,
  test
})

const getAuthorizedHeader = (store) => {
  const credentials = store.getState().currentUser.credentials
  const headers = new Headers(credentials)
  return headers
}

//store creation

const createStoreWithMiddleware = applyMiddleware(
  thunk
)(createStore);

const store = createStoreWithMiddleware(rootReducer);

const postLoginRequest = () => {
  return fetch('http://localhost:3000/auth/sign_in', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      email: '[email protected]',
      password: 'password',
    })
  })
}

const getUsers = () => {
  const autorizedHeader = getAuthorizedHeader(store)
  return fetch('http://localhost:3000/users',
    {
      method: 'GET',
      headers : autorizedHeader
    }
  )
}

const getWorks = () => {
  const autorizedHeader = getAuthorizedHeader(store)
  return fetch('http://localhost:3000/work_offers',
    {
      method: 'GET',
      headers : autorizedHeader
    }
  )
}
// this request works fine
store.dispatch(submitLogin())

// this request works fine
setTimeout(() => {
  store.dispatch(performRequest(getUsers))
}, 3000)

// this fails
setTimeout(() => {
  store.dispatch(performRequest(getWorks))
}, 5000)