是否有办法更改Web Api的错误消息的默认行为,例如:
GET /trips/abc
回复(转述):
HTTP 500 Bad Request
{
"Message": "The request is invalid.",
"MessageDetail": "The parameters dictionary contains a null entry for parameter 'tripId' of non-nullable type 'System.Guid' for method 'System.Net.Http.HttpResponseMessage GetTrip(System.Guid)' in 'Controllers.TripController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter."
}
我想避免提供有关我的代码的相关详细信息,而是用以下内容替换它:
HTTP 500 Bad Request
{
error: true,
error_message: "invalid parameter"
}
我可以在UserController中执行此操作,但代码执行甚至没有那么远。
编辑:
我找到了一种从输出中删除详细错误消息的方法,使用Global.asax.cs中的这行代码:
GlobalConfiguration.Configuration.IncludeErrorDetailPolicy =
IncludeErrorDetailPolicy.LocalOnly;
这会产生如下消息:
{
"Message": "The request is invalid."
}
哪个更好,但不完全是我想要的 - 我们已经指定了许多数字错误代码,这些代码映射到客户端的详细错误消息。我想只输出相应的错误代码(我可以在输出之前选择,最好是看看发生了什么样的异常),例如:
{ error: true, error_code: 51 }
答案 0 :(得分:8)
即使您想要隐藏有关实际异常的详细信息,您也可能希望将数据的形状保持为HttpError类型。为此,您可以添加自定义DelegatingHandler来修改服务引发的HttpError。
以下是DelegatingHandler的示例:
public class CustomModifyingErrorMessageDelegatingHandler : DelegatingHandler
{
protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
return base.SendAsync(request, cancellationToken).ContinueWith<HttpResponseMessage>((responseToCompleteTask) =>
{
HttpResponseMessage response = responseToCompleteTask.Result;
HttpError error = null;
if (response.TryGetContentValue<HttpError>(out error))
{
error.Message = "Your Customized Error Message";
// etc...
}
return response;
});
}
}
答案 1 :(得分:2)
Maggie的回答对我也有用。谢谢发帖!
只是想在她的代码中添加一些内容以获得更多说明:
HttpResponseMessage response = responseToCompleteTask.Result;
HttpError error = null;
if ((!response.IsSuccessStatusCode) && (response.TryGetContentValue(out error)))
{
// Build new custom from underlying HttpError object.
var errorResp = new MyErrorResponse();
// Replace outgoing response's content with our custom response
// while keeping the requested MediaType [formatter].
var content = (ObjectContent)response.Content;
response.Content = new ObjectContent(typeof (MyErrorResponse), errorResp, content.Formatter);
}
return response;
其中:
public class MyErrorResponse
{
public MyErrorResponse()
{
Error = true;
Code = 0;
}
public bool Error { get; set; }
public int Code { get; set; }
}