如何在使用IdentityServer4时检查客户端上的拒绝访问?

我有一个登录页面,我需要当用户单击“取消”按钮时,将他重定向到客户端应用程序上的“拒绝访问”页面。

内部登录操作:

 if (button != "login")
        {
            // the user clicked the "cancel" button
            var context = await interaction.GetAuthorizationContextAsync(model.ReturnUrl);
            if (context != null)
            {
                // if the user cancels, send a result back into IdentityServer as if they 
                // denied the consent (even if this client does not require consent).
                // this will send back an access denied OIDC error response to the client.
                await interaction.GrantConsentAsync(context, ConsentResponse.Denied);

                // we can trust model.ReturnUrl since GetAuthorizationContextAsync returned non-null
                return Redirect(model.ReturnUrl);
            }
        }

在客户端(MVC)上,我配置了以下事件:

options.Events = new OpenIdConnectEvents
                {
                    OnRemoteFailure = context => 
                    {
                        // here it's returned as 200 ok in case I denied 
                        // consent should'nt be 401 access denined??
                        var statusCode=context.Response.StatusCode;
                        context.Response.Redirect("/");
                        context.HandleResponse();

                        return Task.FromResult(0);
                    }
                };

但我的问题是:我如何知道identityserver4失败是因为用户单击了cancel按钮(访问被拒绝)还是因为有其他问题导致了失败?