What Is CORS and Why Is It Important?

Overview

One of the most basic things we can do to our ASP.NET Core application to make it more secure is to enable CORS policies. CORS stands for cross-origin resource sharing. It’s all about allowing (or restricting) access to the client applications hosted on specific domains that the clients are hosted on.

Configuring the CORS

CORS configuration doesn’t just apply to the SignalR. It applies to the entire ASP.NET Core application and all of its HTTP endpoints, including SignalR.