django .htaccess中的[QSA，L]是什么意思？

Question

在此部署说明https://docs.djangoproject.com/en/1.8/howto/deployment/fastcgi/中，它说：

In your Web root directory, add this to a file named .htaccess:
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    .
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AddHandler fcgid-script .fcgi
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ mysite.fcgi/$1 [QSA,L]

[QSA,L]的含义是什么？