Trouble with CORS Policy and .NET Core 3.1

Question

I\'m not sure what I\'m missing, but can\'t seem to get my CORS Policy working with .NET Core 3.1 and Angular 8 client-side.

Startup.cs:

Answer 1

first app.UseRouting(); then app.UseCors("foo");

Change your Configure method like the following :

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }

    app.UseHttpsRedirection();



    app.UseRouting();  // first
    // Use the CORS policy
    app.UseCors("foo"); // second

    app.UseAuthorization();

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });
}

It worked for me !