Owin / WebApi强制仅接受application / json Accept和Content-Type标头

Question

I need to configure my Owin self-host to accept only application/json Accept and Content-Type headers. For any other Accept received from client (for example application/xml ) i want to return an Http 415 Unsupported Media Type).

I've tried all solutions but none of them seem to work. http://www.strathweb.com/2013/06/supporting-only-json-in-asp-net-web-api-the-right-way/

I tried to clear all formatters in my HttpConfiguration and add only the Json one:

configuration.Formatters.Clear();
configuration.Formatters.Add(new JsonMediaTypeFormatter());

Doesn't work, it still returns 200 Ok for any media type.

I've tried to replace the DefaultContentNegotiator with my own JsonContentNegotiator as in the example from the link above, still with no luck.

I ended up with the solution that i'm myself verifying the headers in my Controller. But that's a pretty ugly solution. Is there any way to achieve this with webapi?

Answer 1

Did you try using delegate handlers ?

public class MediaTypeDelegatingHandler: DelegatingHandler
{
    protected async override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        if (request.Headers.Accept.Contains(MediaTypeWithQualityHeaderValue.Parse("application/json")) == false)
        {
            return request.CreateResponse(HttpStatusCode.UnsupportedMediaType);
        }
        return await base.SendAsync(request, cancellationToken);
    }
}

and

 public static void Register(HttpConfiguration config)
    {
        config.MessageHandlers.Add(new MediaTypeDelegatingHandler());
    }

I haven't tried the code but if you don't have a solution yet you can give it a try.