public void InstallServices(IServiceCollection services, IConfiguration configuration)
{
var facebookAuthSettings = new FaceBookAuthSettings();
configuration.Bind(nameof(facebookAuthSettings), facebookAuthSettings);
services.AddSingleton(facebookAuthSettings);
services.AddHttpClient();
services.AddSingleton <IFacebookAuthService, FacebookAuthService>();
}
public FacebookAuthService(FaceBookAuthSettings faceBookAuthSettings, IHttpClientFactory httpClientFactory)
{
_faceBookAuthSettings = faceBookAuthSettings;
_httpClientFactory = httpClientFactory;
}