这是一个奇怪的问题。我正在运行 MVC 3 并有一个自定义操作结果，它包装异常并返回一条消息以及标准 HTTP 错误。

public class ExceptionResult : ActionResult
{
    private readonly Exception _exception;

    public ExceptionResult(Exception exception)
    {
        _exception = exception;
    }

    public override void ExecuteResult(ControllerContext context)
    {
        var response = context.HttpContext.Response;
        response.ClearHeaders();
        response.Cache.SetNoStore();
        response.ContentType = ContentType.Json;

        var baseEx = _exception as BaseException ?? new ServerException(_exception);

        var result = baseEx.GetResult();

        var json = result.ToJSON();
        response.Write(json);
        response.StatusCode = (int)result.Status.Code;
    }
}

当我在本地运行时，我得到的正是我所期望的:

HTTP/1.1 400 Bad Request
Cache-Control: no-store
Content-Type: application/json; charset=utf-8
Server: Microsoft-IIS/7.5
X-AspNet-Version: 4.0.30319
Date: Thu, 01 Dec 2011 19:00:03 GMT
Content-Length: 81

{"error":"invalid_request","error_description":"Parameter grant_type is missing"}

但是当我尝试从另一台机器连接时，我得到的是标准 IIS 错误消息:

HTTP/1.1 400 Bad Request
Cache-Control: no-store
Content-Type: text/html
Server: Microsoft-IIS/7.5
X-AspNet-Version: 4.0.30319
Date: Thu, 01 Dec 2011 19:02:33 GMT
Content-Length: 11

Bad Request

更新

IIS 管道中一定有某个 http 模块正在吞噬响应并重写内容。我编写了一个模块来记录请求和响应，它返回的正是我所期望的，但是实际上将它发送到浏览器的是错误的。

2011-12-02 15:39:00,518 - ======== Request ========
2011-12-02 15:39:00,518 - GET /oauth/2/token HTTP/1.1
2011-12-02 15:39:00,519 - Cache-Control: max-age=0
2011-12-02 15:39:00,519 - Connection: keep-alive
2011-12-02 15:39:00,519 - Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
2011-12-02 15:39:00,519 - Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
2011-12-02 15:39:00,519 - Accept-Encoding: gzip,deflate,sdch
2011-12-02 15:39:00,519 - Accept-Language: en-US,en;q=0.8
2011-12-02 15:39:00,519 - Host: micah-pc:8095
2011-12-02 15:39:00,519 - User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2
2011-12-02 15:39:00,519 - =========================
2011-12-02 15:39:00,519 - OAuth exception occurred.
BoomTown.OAuth.OAuthException: Parameter grant_type is missing
   at BoomTown.OAuth.Request.TokenRequest.GetRequestValidator() in C:\code\BoomTown\Api\BoomTown.OAuth\Request\TokenRequest.cs:line 19
   at BoomTown.OAuth.Request.OAuthRequestBase.Validate() in C:\code\BoomTown\Api\BoomTown.OAuth\Request\OAuthRequestBase.cs:line 33
   at BoomTown.OAuth.Request.OAuthRequestBase..ctor(HttpRequestBase request, IOAuthServiceLocator serviceLocator) in C:\code\BoomTown\Api\BoomTown.OAuth\Request\OAuthRequestBase.cs:line 28
   at BoomTown.OAuth.Request.TokenRequest..ctor(HttpRequestBase request, IOAuthServiceLocator serviceLocator) in C:\code\BoomTown\Api\BoomTown.OAuth\Request\TokenRequest.cs:line 13
   at BoomTown.Api.Web.Controllers.OAuth.V2.OAuthController.Token() in C:\code\BoomTown\Api\BoomTown.Api.Web\Controllers\OAuth\V2\OAuthController.cs:line 26
2011-12-02 15:39:00,520 - ======= Response =======
2011-12-02 15:39:00,520 - HTTP/1.1 400 Bad Request
2011-12-02 15:39:00,520 - Cache-Control: no-store
2011-12-02 15:39:00,520 - X-AspNet-Version: 4.0.30319
2011-12-02 15:39:00,520 - Content-Type: application/json; charset=utf-8
2011-12-02 15:39:00,520 - {"error":"invalid_request","error_description":"Parameter grant_type is missing"}

解决方案

多亏了一点调查，我才弄明白了。我设置了 IIS 跟踪，这证实了我的怀疑，它与拦截我的请求并覆盖我的错误消息的 customerrormodule 有关。我一直在玩弄

<system.web>
  <customErrors />
<system.web>

设置但无济于事。我走在正确的轨道上，但由于我运行的是 IIS 7，我需要像这样更改正确的 web.config 部分:

  <system.webServer>
    <httpErrors errorMode="Detailed" />
  </system.webServer>

现在我所有的自定义 JSON 消息都可以完美通过。非常感谢 Jason Finneyfrock对于这个标签团队。

最佳答案

在您的 web.config 中，您是否将 httpErrors 定义为仅 DetailedLocalOnly？我不确定在这种情况下是否会删除内容。

http://www.iis.net/ConfigReference/system.webServer/httpErrors

关于c# - 无法远程返回自定义 HTTP 错误详细信息，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8346836/