Starting with ASP.NET 4.7.1 we are introducing support for the HTTP/2 standard. This new version of the HTTP protocol delivers a true multiplexing of requests and responses between browser and web server. This exciting update is as easy as enabling SSL in your web projects to immediately improve your ASP.NET application responsiveness. With SSL enabled (which is a requirement of the HTTP/2 protocol), IISExpress on Windows 10 will begin interacting with the browser using the updated protocol. The difference between the protocols is clear.