ErrorHandler.php

<?php
namespace Http\Handlers;

use Slim\Handlers\Error;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;

/**
 * Class ErrorHandler
 *
 * @package Http\Handlers
 */
class ErrorHandler extends Error
{
    /**
     * @param ServerRequestInterface $request
     * @param ResponseInterface $response
     * @param \Exception $exception
     *
     * @return ResponseInterface|static
     */
    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, \Exception $exception)
    {
        $response = parent::__invoke($request, $response, $exception);
        return $response->withHeader('X-LiteSpeed-Cache-Control', 'no-cache');
    }
}

PhpErrorHandler.php

<?php
namespace Http\Handlers;

use Slim\Handlers\PhpError;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;

/**
 * Class PhpErrorHandler
 *
 * @package Http\Handlers
 */
class PhpErrorHandler extends PhpError
{
    /**
     * @param ServerRequestInterface $request
     * @param ResponseInterface $response
     * @param \Throwable $error
     *
     * @return ResponseInterface|static
     */
    public function __invoke(ServerRequestInterface $request, ResponseInterface $response, \Throwable $error)
    {
        $response = parent::__invoke($request, $response, $error);
        return $response->withHeader('X-LiteSpeed-Cache-Control', 'no-cache');
    }
}