在REST服务中，服务端如果产生了异常信息，无论是业务异常或是系统异常，如果直接将异常抛出，在客户端浏览器中，是无法获取异常的详细，只能获取一个StateCode 500 Internal Server Error错误，如下：
HTTP/ Internal Server Error Content-Length: Content-Type: text/xml; charset=utf- Server: Microsoft-HTTPAPI/2.0 Date: Tue, Jul :: GMT <Error><Message>An error has occurred.</Message></Error>
如需要在客户端获取服务端的详细异常信息，需要如下定义异常信息：
var resp = new HttpResponseMessage(HttpStatusCode.Forbidden)
{
Content = new StringContent("Not allowed to delete this resource"),
ReasonPhrase = "forbidden"
};
throw new HttpResponseException(resp);
抛出HttpResponseException即可在客户端（浏览器，调试工具如Fiddler）中进行捕获并进行对应处理，如下所示：
HTTP/ forbidden Content-Length: Content-Type: text/plain; charset=utf- Server: Microsoft-HTTPAPI/2.0 Date: Tue, Jul :: GMT Not allowed to delete this resource