On refresh react route giving 404 error

I have routes

<Router history={browserHistory}>
    <Route exact path="/" component={Dashboard} />
    <Route exact path="/ViewUser" component={ViewUser} />
    <Route exact path="/AddUser" component={AddUser}/>
</Router>

When i click on link like viewuser it renders viewuser component

But when i refresh page on viewuser its give me 404 error.