ASP.NET core Cors policy

Question

I'm having problem setting up Cors policy in my ASP.NET core project.

public void ConfigureServices(IServiceCollection services)
{
    services.AddCors(options =>
    {
        options.AddPolicy("AllowAll",
            builder =>
            {
                builder
                .AllowAnyOrigin() 
                .AllowAnyMethod()
                .AllowAnyHeader()
                .AllowCredentials();
            });
    });
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        services.AddMemoryCache();
}

I've tried adding app.UseCors("AllowAll"); in Configure(IApplicationBuilder app, IHostingEnvironment env) , tried [EnableCors("AllowAll")] before controller declaration:

[Route("api/[controller]")]
[ApiController]
[EnableCors("AllowAll")]
public class TestController : ControllerBase

and before method declaration:

[HttpPost]
[EnableCors("AllowAll")]
public JsonResult Post([FromBody] dynamic request)

and no luck, I'm keep getting "Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at..."

Maybe someone can help me?

Answer 1

I know this is too late, but can help someone,

using CorsMiddleware in specified order is matters

app.UseRouting();
app.UseCors("AllowAll");
app.UseAuthorization();
app.UseResponseCaching();

1. The call to UseCors must be placed after UseRouting, but before UseAuthorization.
2. When using Response Caching Middleware, call UseCors before UseResponseCaching