HttpClient - "Unsupported Media Type"

Question

I'm a trying to post the following request but I am getting a "Unsupported Media Type" response. I am setting the Content-Type to application/json . Any help would be appreciated.

var json = JsonConvert.SerializeObject(request);
var stringContent = new StringContent(json, UnicodeEncoding.UTF8, "application/json");
MyResult result = new MyResult();
using (var client = new HttpClient())
{
    client.BaseAddress = new Uri(baseurl);
    client.DefaultRequestHeaders.Clear();               
    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", base64ApiKey);
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));               
    HttpResponseMessage Res = await client.PostAsync(method, stringContent);
    if (Res.IsSuccessStatusCode)
    {
        var response = Res.Content.ReadAsStringAsync().Result;
        result = JsonConvert.DeserializeObject<MyResult>(response);
    }               
}

Answer 1

After inspecting the raw data sent from my code, I saw that this line was adding the charset:

var stringContent = new StringContent(json, UnicodeEncoding.UTF8, "application/json");

The actual data sent looked like this:

Content-Type: application/json; charset=utf-8

I needed to remove the charset from the request with:

stringContent.Headers.ContentType.CharSet = string.Empty;