[c#] How to enable CORS in ASP.net Core WebAPI

In launchSettings.json, under iisSettings, set anonymousAuthentication to true:

"iisSettings": {
    "windowsAuthentication": true,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:4200/",
      "sslPort": 0
    }
  }

Then, in Startup.cs, under ConfigureServices, before services.AddMvc, add:

services.AddCors(options => options.AddPolicy("ApiCorsPolicy", builder =>
{
    builder
        .AllowAnyOrigin()
        .WithHeaders(HeaderNames.AccessControlAllowHeaders, "Content-Type")
        .AllowAnyMethod()
        .AllowCredentials();
}));

and then, in configure method, before app.UseMvc() add:

app.UseCors("ApiCorsPolicy");

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