Vuetify DataTable sortable and filter not work after read data from api laravel

Vuetify DataTable sortable and filter not work after read data from api laravel

Sorting and filtering does not work when I read data from Laravel API.

Works for static data.

<v-data-table
        :headers="headers"
        :items="posts"
        class="elevation-1"
      ></v-data-table>


data () {
    return {
      headers: [
 
        { text: 'id', value: 'id' },
        { text: 'title', value: 'title' },
      ],
      posts: []
})