src/WorkerF/Exceptions/ExceptionHandler.php
public function handle(\Exception $e)
    {
        $httpCode = 500;
        // create http response header
        if (property_exists($e, 'httpCode') && 
           array_key_exists($e->httpCode, Response::$statusCodes)
        ) { // is a http exception
            $httpCode = $e->httpCode;
            $header = Response::$statusCodes[$httpCode];
        } else { // other exception
            $header = Response::$statusCodes[$httpCode];
            Error::printError($e); // if Server error, echo to stdout
        }

        Response::header($header);    

        return Error::errorHtml($e, $header, Config::get('app.debug'));
    }
public function handle(\Exception $e)
    {
        $httpCode = 500;
        // create http response header
        if (property_exists($e, 'httpCode') && 
           array_key_exists($e->httpCode, Response::$statusCodes)
        ) { // is a http exception
            $httpCode = $e->httpCode;
            $header = Response::$statusCodes[$httpCode];
        } else { // other exception
            $header = Response::$statusCodes[$httpCode];
            Error::printError($e); // if Server error, echo to stdout
        }

        Response::header($header);    

        return Error::errorHtml($e, $header, Config::get('app.debug'));
    }
ExceptionHandler handle.

@param \Exception $e
@return string