4. Generate users model and service

src/pages/users/models/users.js

+import * as usersService from '../services/users';
+
+export default {
+  namespace: 'users',
+  state: {
+    list: [],
+    total: null,
+  },
+  reducers: {
+    save(state, { payload: { data: list, total } }) {
+      return { ...state, list, total };
+    },
+  },
+  effects: {
+    *fetch({ payload: { page } }, { call, put }) {
+      const { data, headers } = yield call(usersService.fetch, { page });
+      yield put({ type: 'save', payload: { data, total: headers['x-total-count'] } });
+    },
+  },
+  subscriptions: {
+    setup({ dispatch, history }) {
+      return history.listen(({ pathname, query }) => {
+        if (pathname === '/users') {
+          dispatch({ type: 'fetch', payload: query });
+        }
+      });
+    },
+  },
+};

src/pages/users/services/users.js

+import request from '../../../utils/request';
+
+export function fetch({ page = 1 }) {
+  return request(`/api/users?_page=${page}&_limit=5`);
+}

src/utils/request.js

 import fetch from 'dva/fetch';
 
-function parseJSON(response) {
-  return response.json();
-}
-
 function checkStatus(response) {
   if (response.status >= 200 && response.status < 300) {
     return response;
@@ -21,10 +17,21 @@ function checkStatus(response) {
  * @param  {object} [options] The options we want to pass to "fetch"
  * @return {object}           An object containing either "data" or "err"
  */
-export default function request(url, options) {
-  return fetch(url, options)
-    .then(checkStatus)
-    .then(parseJSON)
-    .then(data => ({ data }))
-    .catch(err => ({ err }));
+export default async function request(url, options) {
+  const response = await fetch(url, options);
+
+  checkStatus(response);
+
+  const data = await response.json();
+
+  const ret = {
+    data,
+    headers: {},
+  };
+
+  if (response.headers.get('x-total-count')) {
+    ret.headers['x-total-count'] = response.headers.get('x-total-count');
+  }
+
+  return ret;
 }