Sessions do not seem to work correctly on your server.
'.
                'Make sure the variable "session.save_path" is set correctly in your PHP config, '.
                'and that you have write access to it.
'.
                'It currently points to %s.
'.
                'On some browsers, accessing your server via a hostname like \'localhost\' '.
                'or any custom hostname without a dot causes cookie storage to fail. '.
                'We recommend accessing your server via it\'s IP address or Fully Qualified Domain Name.
'
            );
            $msg = sprintf($msg, $this->container->sessionManager->getSavePath());

            $this->assignView('message', $msg);

            return $response->write($this->render('error'));
        }

        return $this->redirect($response, '/install');
    }

    /**
     * Save installation form and initialize config file and datastore if necessary.
     */
    public function save(Request $request, Response $response): Response
    {
        $timezone = 'UTC';
        if (!empty($request->getParam('continent'))
            && !empty($request->getParam('city'))
            && isTimeZoneValid($request->getParam('continent'), $request->getParam('city'))
        ) {
            $timezone = $request->getParam('continent') . '/' . $request->getParam('city');
        }
        $this->container->conf->set('general.timezone', $timezone);

        $login = $request->getParam('setlogin');
        $this->container->conf->set('credentials.login', $login);
        $salt = sha1(uniqid('', true) .'_'. mt_rand());
        $this->container->conf->set('credentials.salt', $salt);
        $this->container->conf->set('credentials.hash', sha1($request->getParam('setpassword') . $login . $salt));

        if (!empty($request->getParam('title'))) {
            $this->container->conf->set('general.title', escape($request->getParam('title')));
        } else {
            $this->container->conf->set(
                'general.title',
                'Shared bookmarks on '.escape(index_url($this->container->environment))
            );
        }

        $this->container->conf->set('translation.language', escape($request->getParam('language')));
        $this->container->conf->set('updates.check_updates', !empty($request->getParam('updateCheck')));
        $this->container->conf->set('api.enabled', !empty($request->getParam('enableApi')));
        $this->container->conf->set(
            'api.secret',
            generate_api_secret(
                $this->container->conf->get('credentials.login'),
                $this->container->conf->get('credentials.salt')
            )
        );

        try {
            // Everything is ok, let's create config file.
            $this->container->conf->write($this->container->loginManager->isLoggedIn());
        } catch (\Exception $e) {
            $this->assignView('message', $e->getMessage());
            $this->assignView('stacktrace', $e->getTraceAsString());

            return $response->write($this->render('error'));
        }

        if ($this->container->bookmarkService->count(BookmarkFilter::$ALL) === 0) {
            $this->container->bookmarkService->initialize();
        }

        $this->container->sessionManager->setSessionParameter(
            SessionManager::KEY_SUCCESS_MESSAGES,
            [t('Shaarli is now configured. Please login and start shaaring your bookmarks!')]
        );

        return $this->redirect($response, '/');
    }

    protected function checkPermissions(): bool
    {
        // Ensure Shaarli has proper access to its resources
        $errors = ApplicationUtils::checkResourcePermissions($this->container->conf);

        if (empty($errors)) {
            return true;
        }

        // FIXME! Do not insert HTML here.
        $message = '
'. t('Insufficient permissions:') .'
';

        foreach ($errors as $error) {
            $message .= '
'.$error.'
';
        }
        $message .= '
';

        throw new ResourcePermissionException($message);
    }
}