Exceptions returned as plain text description of the http error code

1

My response class is

public class CreateXXXResponse : IHasResponseStatus
{
    public ResponseStatus ResponseStatus { get; set; }
    public XXX Result { get; set; }
}

When I there is no Exception, all is returned as a nice json with Result properly rendered.

However, when there is an exception, say BadRequest, the API returns just “BadRequest” plaintext, without any json though ResponseStatus is populated properly - I have put a breakpoint into the class.

What could be the cause?

The app is ASP.NET MVC with ServiceStack running the API.

2

Please post the raw HTTP Request and Response using something like Chrome Web Inspector or Fiddler.

3

The models are these:

[Route("/apiversion", "GET")]
public class GetApiVersion : IReturn<GetApiVersionResponse>
{
}

public class GetApiVersionResponse : IHasResponseStatus
{
    public ResponseStatus ResponseStatus { get; set; }
    public string Version { get; set; }
}

The service is

public class ApiVersionService
{
    public object Get(GetApiVersion request)
    {
            throw new ArgumentException("Wrong Result");
    }
}

The request logs:

Request URL:http://localhost:7132/api/apiversion
Request Method:GET
Status Code:400 ArgumentException
Remote Address:[::1]:7132
Referrer Policy:no-referrer-when-downgrade

Response Headers

HTTP/1.1 400 ArgumentException
Cache-Control: private
Content-Type: text/html
Vary: Accept
Server: Microsoft-IIS/10.0
X-Powered-By: ServiceStack/4.512 NET45 Win32NT/.NET
X-Startup-Errors: 1
X-AspNet-Version: 4.0.30319
X-SourceFiles: =?UTF-8?B?RTpcRHJvcGJveCAoUm9ja2V0RWRnZS5jb20pXHNyY1xDbGllbnRzXE15TWVjaGFuaWMubWVcTXlNZWNoYW5pYy5Eb3ROZXRcTXlNZWNoYW5pYy5XZWJcTXlNZWNoYW5pYy5XZWJcYXBpXGFwaXZlcnNpb24=?=
X-Powered-By: ASP.NET
Date: Tue, 27 Jun 2017 13:31:59 GMT
Content-Length: 11

Request Headers

Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding:gzip, deflate, sdch, br
Accept-Language:en-US,en;q=0.8,de;q=0.6
Cache-Control:max-age=0
Connection:keep-alive
Cookie:ss-id=WvpfQmGUitQqmnx63GXb; ss-pid=4hZ6pSzclHbrL36hwzRp
DNT:1
Host:localhost:7132
Upgrade-Insecure-Requests:1
User-Agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36

Response:

Bad Request
4

Your ApiVersionService class should inherit Service but I’m assuming it already does and you’re not providing the exact implementation.

I’m not sure why you’re a plain text ‘Bad Request’ response, as the request is being called from a Browser so you should be seeing a HTML response. I’m assuming you have some other configuration that’s interfering with the response. If you can put a small stand-alone example on GitHub I can investigate further and identify the issue.

5

Yes, the Service is inherited via another class.

I found the cause. For the ASP.NET MVC we require redirect of all 404 and 500 errors to a specific website (done via web.config)

it apparently interferes with ServiceStack’s error handling.

        <httpErrors errorMode="Custom" existingResponse="Replace">
            <clear />
            <error statusCode="404" path="http://XXX.com" responseMode="Redirect" />
            <error statusCode="500" path="http://XXX.com" responseMode="Redirect" />
        </httpErrors>

Can you see a way how to get it work with ServiceStack API? The app is ASP.NET MVC with ServiceStack’s provided API.

6

The issue is MVC hijacking the Error Responses which happens outside of ServiceStack. Have a look at the Form Hijacking Prevention docs for how you can prevent some errors responses being hijacked.

7

Ha! This is most useful! Thank you!