public static IIdentityServerBuilder AddInMemoryClientStoreExtra(this IIdentityServerBuilder builder)
{
builder.Services.RemoveAll <IClientStore>();
builder.Services.TryAddTransient <InMemoryClientStoreExtra>();
builder.Services.TryAddTransient <IClientStoreExtra, InMemoryClientStoreExtra>();
builder.AddClientStoreCacheExtra <InMemoryClientStoreExtra>();
return(builder);
}