可以在发起logout请求时，添加一个调用“prompt=none”参数的参数，如果logout成功且用户能够使用“prompt=none”参数，则应用程序会返回“HTTP 204 No Content”响应。如果该用户未找到或未能使用“prompt=none”参数，则应用程序会返回“HTTP 401 Unauthorized”响应。

具体实现可以参考下面的代码示例：

//添加prompt=none参数 string logoutUrl = new RequestUrl(await _interactionGenerator.GetLogoutContextAsync(logoutId)).CreateLogoutUrl(new IdentityServerAuthenticationOptions { Authority = _environment.GetIdentityServerAuthority(), AutomaticAuthenticate = false, AutomaticChallenge = false, RequireHttpsMetadata = true, SaveToken = true, ClientId = "implicit", AuthenticationScheme = IdentityServerConstants.DefaultCookieAuthenticationScheme, ResponseType = GalleryConstants.AuthenticationResponseType, GetClaimsFromUserInfoEndpoint = true }, additionalQueryParamaters: new Dictionary() { { "prompt", "none" } });

//检查是否允许SignOutAsync if (await HttpContext.Authentication.GetAuthenticateInfoAsync("Cookies") == null) //如果没有登录，则直接重定向到/logout路径 { return new RedirectResult("~/logout" + HttpContext.Request.QueryString); }

var authenticationProps = new AuthenticationProperties { RedirectUri = redirectUrl }; await HttpContext.Authentication.SignOutAsync("Cookies", authenticationProps); //执行注销

//检查注销是否成功 var response = await _httpClient.SendAsync(new HttpRequestMessage(HttpMethod.Get, logoutUrl)); if (response.IsSuccessStatusCode) //如果返回状态码为“No Content”，则表示注销成功 { return new RedirectResult(logoutUrl); } else if (response.StatusCode == HttpStatusCode.Unauthorized) //返回状态码为“Unauthorized”，则表示用户未登录或无法使用“prompt=none”参数 { Log.Error("Failed to sign out user due to missing or invalid login session", requestUrl: requestUrl);

return new RedirectResult(redirectUrl);

} else //其他情况下，抛出异常 { throw new Exception($"Failed to sign out user. StatusCode='{response