angular inner page in refresh 404 after ng build

1import {bootstrap} from 'angular2/platform/browser';
2import {provide} from 'angular2/core';
3import {ROUTER_PROVIDERS} from 'angular2/router';
4import {LocationStrategy, HashLocationStrategy} from '@angular/common';
5
6import {MyApp} from './myapp';
7
8bootstrap(MyApp, [
9  ROUTER_PROVIDERS,
10  {provide: LocationStrategy, useClass: HashLocationStrategy}
11]);
12