.NET CORS Guide: What It Is and How to Enable It

When dealing with a front-end app accessing a .NET API, developers might encounter errors related to the Cross-Origin Resource Sharing (CORS) policy, which can block access due to security restrictions known as the same-origin policy. This policy is essential for web safety, preventing scripts from interacting with unauthorized resources. However, there are legitimate cases, such as a client accessing a back-end API, where bypassing this restriction is necessary. The article provides a detailed guide on how to enable CORS in a .NET API by setting up a simple API and allowing requests from a specified origin using the HTTP method GET, with any header, through modifications in the Program.cs file. By understanding and implementing CORS, developers can safely relax these restrictions, facilitating smooth communication between different application components, while maintaining security.