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What Is CORS and Why Is It Important?

Explore the concept of Cross-Origin Resource Sharing (CORS) and its importance in securing SignalR applications. Understand how to configure CORS policies in an ASP.NET Core app to control client access based on domain origins. This lesson guides you through adding and applying CORS policies to restrict or allow requests, enhancing your app’s security.

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. ...