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ASP.NET Web API–Mediatype exception on POST

When trying to send some JSON data through an HTTP POST, I got the following exception message back:

The request entity's media type 'text/plain' is not supported for this resource. No MediaTypeFormatter is available to read an object of type 'TransportDocument' from content with media type 'text/plain'

This error showed up because I forgot to specify the content type in the HTTP headers. Here is one way how to fix this:

var json = JsonConvert.SerializeObject(body);
var content = new StringContent(json);
content.Headers.ContentType= new MediaTypeHeaderValue("application/json");
return _client.PostAsync(requestUri, content);
view raw MediaTypeHeader.cs hosted with ❤ by GitHub

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