How to enable cors in ASP.NET Core 6.0 Web API project?

Question

Aryan Kumar · Answer

Enabling Cross-Origin Resource Sharing (CORS) in an ASP.NET Core 6.0 Web API project allows your API to respond to requests from different domains or origins. To enable CORS, you can follow these steps:
Install the Microsoft.AspNetCore.Cors Package (if not already installed):
Make sure you have the Microsoft.AspNetCore.Cors package added to your project. If it's not already included, you can add it using the following command:
dotnet add package Microsoft.AspNetCore.Cors
Configure CORS in the Startup.cs File:
In your Startup.cs file, you need to configure CORS services in the
ConfigureServices method and set up CORS policies in the 
Configure method.
csharpCopy code
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.DependencyInjection;
public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddCors(options =>
        {
            options.AddPolicy("AllowSpecificOrigin", builder =>
            {
                builder
                    .WithOrigins("http://example.com", "https://example.com")
                    .AllowAnyHeader()
                    .AllowAnyMethod();
            });
        });
        // Other services configuration
    }
    public void Configure(IApplicationBuilder app)
    {
        // ...
        app.UseCors("AllowSpecificOrigin"); // Apply the CORS policy
        // ...
        app.UseRouting();
        // ...
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });
    }
}
In the code above:
We've added CORS services by calling services.AddCors in the
ConfigureServices method.We've configured a CORS policy named "AllowSpecificOrigin" that allows requests from "http://example.com" and "https://example.com." You can customize the allowed origins, headers, and methods according to your requirements.
Apply the CORS Policy:
To apply the CORS policy to your controllers or specific actions, you can use the
[EnableCors] attribute:
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Cors;
[ApiController]
[Route("api/[controller]")]
public class MyController : ControllerBase
{
    [HttpGet]
    [EnableCors("AllowSpecificOrigin")] // Apply the CORS policy
    public IActionResult Get()
    {
        // Your action logic here
    }
}
In this example, the "AllowSpecificOrigin" CORS policy is applied to the 
Get action of the MyController.
With these configurations, your ASP.NET Core 6.0 Web API project is now set up to allow cross-origin requests from the specified domains. Be sure to customize the CORS policy to match your specific needs, such as allowing multiple origins, headers, or methods.

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How to enable cors in ASP.NET Core 6.0 Web API project?

Utpal Vishwas

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