如何返回自定義503消息？

Question

我有一個在MVC4/ASP.NET Web Api中實現的服務。我想在系統關閉以進行維護時向客戶返回自定義503消息。

我有以下代碼：

public class ServiceController : ApiController 
    { 
     public HttpResponseMessage<ServiceUnavailableModel> Get() 
     { 
      return new HttpResponseMessage<ServiceUnavailableModel>(new ServiceUnavailableModel(), HttpStatusCode.ServiceUnavailable); 
     } 
    } 

我的模型看起來是這樣的：

[Serializable] 
    public class ServiceUnavailableModel : ISerializable 
    { 
     public ServiceUnavailableModel() 
     { 
      this.Message = Resources.SDE_SERVICE_UNAVAILABLE; 
      this.Detail = Resources.SDE_SERVICE_REQUESTED_CURRENTLY; 
      this.Code = (int)System.Net.HttpStatusCode.ServiceUnavailable; 
     } 

     public string Message { get; set; } 
     public string Detail { get; set; } 
     public int Code { get; set; } 

     public virtual void GetObjectData(SerializationInfo info, StreamingContext context) 
     { 
      info.AddValue("Message", this.Message); 
      info.AddValue("Detail", this.Detail); 
      info.AddValue("Code", this.Code); 
     } 

    } 

這簡直是什麼一堆我目前的API的客戶的期望。但是，當我執行這個動作，我得到以下結果：

HTTP/1.1 503 Service Unavailable 
Cache-Control: no-cache 
Pragma: no-cache 
Content-Type: text/html 
Expires: -1 
Server: Microsoft-IIS/7.5 
X-AspNet-Version: 4.0.30319 
X-Powered-By: ASP.NET 
Date: Mon, 14 May 2012 20:22:39 GMT 
Content-Length: 200 

The service is unavailable.The service you requested is currently 
unavailable or undergoing maintenance. We will have the service back 
up and running shortly. Thank you for your patience.","Code":503} 

注意它如何出現，我的反應是部分系列化。是什麼賦予了？

PS。我試過Response.Clear（）和Response.ClearContent（） - 沒有運氣

Answer 1

事實證明，您必須配置HTTP錯誤通過：

<configuration> 
    <system.webServer> 
    <httpErrors existingResponse="PassThrough"/> 
    </system.webServer> 
<configuration> 

Answer 2

在Global.asax中和捕捉response.statuscode註冊一個Application_Error事件，如果是503，然後在控制器返回正確的消息

請參閱我的答案在下面的帖子

Spring MVC 3: How to provide dynamic content to error page for HTTP 404 errors?