Edit File: facetwp.cls.php
<?php /** * The Third Party integration with FacetWP. * * @since 2.9.9 */ namespace LiteSpeed\Thirdparty; defined( 'WPINC' ) || exit; class Facetwp { public static function detect() { if ( ! defined( 'FACETWP_VERSION' ) ) return; /** * For Facetwp, if the template is "wp", return the buffered HTML * So marked as rest call to put is_json to ESI */ if ( ! empty( $_POST['action'] ) && ! empty( $_POST['data'] ) && ! empty( $_POST['data']['template'] ) && $_POST['data']['template'] === 'wp' ) { add_filter( 'litespeed_esi_params', __CLASS__ . '::set_is_json' ); } } public static function set_is_json( $params ) { $params[ 'is_json' ] = 1; return $params; } }