[
{
code: "json_no_route",
message: "No route was found matching the URL and request method"
}
]

function get_post_details ($params)
{
    $id = $_GET['id'];
    $meta_value = $_GET['meta_value'];

    if(update_post_meta( $id, '_yoast_wpseo_redirect', $meta_value ))
    {
        $post['status'] = 'Successfully Updated';
        $post['flag'] = '1';
    }
    else
    {
        $post['status'] = 'Error';
        $post['flag'] = '0';
    }

    if( empty( $post ) ){
        return null;
    }

    return $post;
}

 // Register the rest route here.

add_action( 'rest_api_init', function () {
    register_rest_route( 'post_info', 'post',array(

            'methods'  => 'GET',
            'callback' => 'get_post_details'

        ));

});