IIS Express

IIS Express, a lightweight (4.5–6.6 MB) version of IIS, is available as a standalone freeware server and may be installed on Windows XP with Service Pack 3 and subsequent versions of Microsoft Windows. IIS 7.5 Express supports only the HTTP and HTTPS protocols. It is portable, stores its configuration on a per-user basis, does not require administrative privileges and attempts to avoid conflicting with existing web servers on the same machine.[35] IIS Express can be downloaded separately[36] or as a part of WebMatrix[37] or Visual Studio 2012 and later.[38] (In Visual Studio 2010 and earlier, web developers developing ASP.NET apps used ASP.NET Development Server, codenamed "Cassini".)[39] By default, IIS Express only serves local traffic.[40][38]