Microsoft made some changes to the web development server of Visual Studio Express 2012 for Web. In Visual Webdeveloper express 2010 it was possible to access the development server from external devices by using a port-forwarding tool like inetd or Fiddler. When used in combination with VSE 2012 this resulted in the error "HTTP Error 400: Bad Request - Invalid Hostname".
It turned out in VSE 2012 Microsoft only allows localhost connections. This limitation makes it very hard to debug web applications on for example the iPad, iPhone and Android based devices, or browsers running other operating systems.
With the modification made by Oxyva.nl it is possible to access the development server of Visual Studio Express 2012 for Web on any device.
Checking out the project on GitHub
$ git clone git://github.com/oxyva/SimpleProxy