What content type to set for ASP/ASPX file upload?

What content type to set for ASP/ASPX file upload?

I want to know what HTTP header Content-Type: to set, when uploading ASP/ASPX files to an IIS web server?

For PHP, it is application/x-php, so my guess would be application/x-asp, however I cannot find any sources that confirm this, e.g. checked http://www.asptutorial.info/sscript/ContentType.html.