Максим

{
       "url": "/",
      "name": "Nikulio"
}

{
    user: {
        url...
        name....
    }
}

function def(promise) {
  return promise.then(cmp => {
    console.info('Dynamic loaded by route: ', cmp.default.displayName) // для тестирования можете логировать имя компонента
    return cmp.default
  })
}

...
<Route path='/signin' getComponent={() => def(import('../containers/SigninContainer'))} />
...

ReactDOM.render(
  <Router history={browserHistory}>
    <Route path="/" component={Layout}>
      <Route path="/sing" component={SignUp}/>
      <Route path="/profile" component={Profile} />
      <Route path="/register_approve" component={Validation} />
      <Route path="/forgot_password" component={ForgotPassword} />
      <Route path="/confirm_email" component={ConfirmEmail} />
      <Route path="/restore_password/:token" component={RestorePassword} />
      <Route path="/confirm_invite" component={ConfirmInvite} />
      <Route path="/my-cabinet" component={Cabinet} />
      <Route path="/members" component={Members} />
      <Route path="/invite-member" component={InviteMember} />

      <Route path="/not_access" component={NotAccess} />

      <Route path="/finance" component={Finance}>
        <Route path="/finance/project" component={FinanceProject}/>
        <Route path="/finance/fixed-costs" component={FinanceFixedCost}/>
        <Route path="/finance/fixed-costs" component={FinanceFixedCost}/>
        <Route path="/finance/salary" component={FinanceSalary}/>
        <Route path="/finance/other" component={FinanceOther}/>
      </Route>
    </Route>
    <Route path="*" component={NotFound} />
  </Router>,
  document.getElementById('root')

{
        test: /\.css$/,
        loader: ExtractTextPlugin.extract({
          fallbackLoader: 'style-loader',
          loader: ['css-loader', 'postcss-loader'],
          publicPath: '/public',
        }),
      }, {
        test: /\.scss$/,
        loader: ExtractTextPlugin.extract({
          fallbackLoader: 'style-loader',
          loader: ['css-loader', 'postcss-loader', 'sass-loader'],
          publicPath: '/public',
        }),
      },

function buildHeaders() {
  const authToken = localStorage.getItem('token')
  return { ...defaultHeaders, Authorization: authToken }
}

export function httpGet(url) { //экспортируете функцию для будущих вызовов
  return fetch(url, { // я использую fetch, но для axios сделать, думаю вы сможете
    headers: buildHeaders(), // те самые заголовки, которые нужны в каждом запросе
  })
  .then(checkStatus) // это уже не важно, у меня в коде просто далее идет еще несколько проверок общих
}

return Object.keys(this.props.posts).map(postId => {
      const currentPost = this.props.posts[postId]
      return (
        <li className="list-group-item" key={currentPost.id}>
          <span className="pull-xs-right">{currentPost.categories}</span>
          <strong>{currentPost.title}</strong>
        </li>
      );
    })

...
import configRoutes from '../../routes'
...
render() {
  return (
    <Provider store={store}>
      <Router history={routerHistory}>
        {configRoutes(store)}
      </Router>
    </Provider>
  )
}

...
<Route path='/secret-area' component={SecretAreaContainer} onEnter={_ensureAuthenticated}>
...

export default function configRoutes(store) {
  function _ensureAuthenticated(nextState, replace, callback) {
    const { dispatch } = store
    const { session } = store.getState()
    const { currentUser } = session // данные по юзеру
    let nextUrl

    if (!currentUser && localStorage.getItem('token')) {
        dispatch(getCurrentAccount())
      }
    } else if (!localStorage.getItem('token')) {
      nextUrl = location.pathname + location.search.replace('?', '&')
      replace('/signin')
    }

    callback()
  }

  // здесь ваши роуты

export function signIn(email, password) {
  return (dispatch, getState) => {

    dispatch({
      type: USER_SIGN_IN_REQUEST,
    })

    const params = {
      email,
      password,
    }

    httpPost(`${API_ROOT_V1}/api/authenticate`, params)
      .then((data) => {
        saveParamsToLS(data) // здесь токен можно сохранить, например
        dispatch(push('/account')) // ваш РЕДИРЕКТ, используется push из react-router-redux (что необязательно)
      })
      .catch((error) => {
        console.warn(`Sign in error: ${JSON.stringify(error)}`) //eslint-disable-line no-console
        dispatch({
          type: USER_SIGN_IN_FAILURE,
          error: error,
        })
      })
  }
}

function createThunkMiddleware(extraArgument) {
  return ({ dispatch, getState }) => next => action => {
    if (typeof action === 'function') {
      return action(dispatch, getState, extraArgument);
    }

    return next(action);
  };
}