如何使用OWIN为多个ADFS端点设置公共Wreply？

using Microsoft.Owin.Security;
using Microsoft.Owin.Security.Cookies;
using Microsoft.Owin.Security.WsFederation;

public void Configuration(IAppBuilder app)
{
    app.UseCookieAuthentication(new CookieAuthenticationOptions
    {
        AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie
    });

    app.UseWsFederationAuthentication(new WsFederationAuthenticationOptions
    {
        Wtrealm = "your_realm",
        MetadataAddress = "https://your_adfs_server/FederationMetadata/2007-06/FederationMetadata.xml",
        Notifications = new WsFederationAuthenticationNotifications
        {
            RedirectToIdentityProvider = (context) =>
            {
                // 根据请求的URL设置Wreply
                string wreply = context.Request.Query["wreply"];
                if (!string.IsNullOrEmpty(wreply))
                {
                    context.ProtocolMessage.Wreply = wreply;
                }
                return Task.FromResult(0);
            }
        }
    });
}