Let's move to the Startup.cs file. If you're a seasoned .NET developer, you might be already familiar with it, since it was first introduced in OWIN-based applications to replace most of the tasks previously handled by the good old Global.asax file.
OWIN (for Open Web Interface for .NET) and comes as part of Project Katana, a flexible set of components released by Microsoft back in 2013 for building and hosting OWIN-based web applications. For additional info, refer to https://www.asp.net/aspnet/overview/owin-and-katana.
However, the similarities end here; the class has been completely rewritten to be as pluggable and lightweight as possible, which means that it will include and load only what's strictly necessary to fulfill our ...
