I am getting a problem with possibly Cors. I am doing local dev(react frontend, asp.net core 2 api backend).

Both IE 11 and Chrome have no problem, but Firefox has a problem with my requests.

I just keep getting Network Error from my calls.

I disabled HSTS in firefox and now I am seeing a warning message

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://localhost:44391/api/tokens/auth. (Reason: CORS request did not succeed).

In my cor right now to make dev simple I just have

public void ConfigureServices(IServiceCollection services)

{

   services.AddCors();

    ...

}









 public void Configure(IApplicationBuilder app, IHostingEnvironment env)

        {

                  app.UseCors(builder => builder

                .AllowAnyOrigin()

                .AllowAnyMethod()

                .AllowAnyHeader()

                .AllowCredentials());

}