/// <summary>
 /// Invoked prior to the <see cref="System.Security.Claims.ClaimsIdentity"/> being saved in a local cookie and the browser being redirected to the originally requested URL.
 /// </summary>
 /// <param name="context"></param>
 /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
 public virtual Task ReturnEndpoint(SinaReturnEndpointContext context)
 {
     return(OnReturnEndpoint(context));
 }
 /// <summary>
 /// Invoked prior to the <see cref="System.Security.Claims.ClaimsIdentity"/> being saved in a local cookie and the browser being redirected to the originally requested URL.
 /// </summary>
 /// <param name="context"></param>
 /// <returns>A <see cref="Task"/> representing the completed operation.</returns>
 public virtual Task ReturnEndpoint(SinaReturnEndpointContext context)
 {
     return OnReturnEndpoint(context);
 }