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How to enable CORS in .Net 6 Application

 To enable CORS (Cross-Origin Resource Sharing) in a .NET 6 application, you can use the AddCors method in the ConfigureServices method of your Startup class. Here are the steps:

  1. In the ConfigureServices method of your Startup class, add the AddCors method to the service collection.
csharp
public void ConfigureServices(IServiceCollection services) { services.AddCors(); // other service configurations }
  1. In the Configure method of your Startup class, add the UseCors method to the middleware pipeline. This should be added before any other middleware that needs to access the CORS headers.
csharp
public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { app.UseCors(options => { options.AllowAnyOrigin(); options.AllowAnyMethod(); options.AllowAnyHeader(); }); // other middleware configurations }
  1. The AllowAnyOrigin(), AllowAnyMethod(), and AllowAnyHeader() methods allow requests from any origin, method, and header, respectively. You can customize the CORS policy by specifying specific origins, methods, and headers using the WithOrigins(), WithMethods(), and WithHeaders() methods.
csharp
options.WithOrigins("https://example.com") .WithMethods("GET", "POST") .WithHeaders("Authorization");
  1. You can also specify the CORS policy globally using the AddCors method, or on a per-controller or per-action basis using the [EnableCors] attribute.
csharp
[EnableCors("PolicyName")] public class MyController : ControllerBase { // controller actions }

Note that enabling CORS can potentially expose your application to security vulnerabilities, so you should always ensure that your CORS policy is properly configured to only allow requests from trusted origins.

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