Unsupported Media Type error when posting to Web API

Question

Making a windows phone application and although I may easily pull from my Web Api I am having trouble posting to it. Whenever posting to the api I get the "Unsupported Media Type" error message and I'm not sure as to why it is happening considering the class I using as the base for my JSON post is the same as the one used in the api.

PostQuote (Post Method)

private async void PostQuote(object sender, RoutedEventArgs e)         {             Quotes postquote = new Quotes(){                 QuoteId = currentcount,                 QuoteText = Quote_Text.Text,                 QuoteAuthor = Quote_Author.Text,                 TopicId = 1019             };             string json = JsonConvert.SerializeObject(postquote);             if (Quote_Text.Text != "" && Quote_Author.Text != ""){                  using (HttpClient hc = new HttpClient())                 {                     hc.BaseAddress = new Uri("http://rippahquotes.azurewebsites.net/api/QuotesApi");                     hc.DefaultRequestHeaders.Accept.Clear();                     hc.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));                     HttpResponseMessage response = await hc.PostAsync(hc.BaseAddress, new StringContent(json));                     if (response.IsSuccessStatusCode)                     {                         Frame.Navigate(typeof(MainPage));                     }                     else                     {                         Quote_Text.Text = response.StatusCode.ToString();                         //Returning Unsupported Media Type//                     }                 }             }         } 

Quotes and Topic (Model)

public class Quotes     {         public int QuoteId { get; set; }         public int TopicId { get; set; }         public string QuoteText { get; set; }         public string QuoteAuthor { get; set; }         public Topic Topic { get; set; }         public string QuoteEffect { get; set; }     }     //Topic Model//     public class Topic     {         public int TopicId { get; set; }         public string TopicName { get; set; }         public string TopicDescription { get; set; }         public int TopicAmount { get; set; }     } 

Answer 1

You should set the media type when creating StringContent

new StringContent(json, Encoding.UTF32, "application/json"); 

Answer 2

I found this question while working on a quick and dirty reverse proxy. I needed form data and not JSON.

This did the trick for me.

string formData = "Data=SomeQueryString&Foo=Bar"; var result = webClient.PostAsync("http://XXX/api/XXX",          new StringContent(formData, Encoding.UTF8, "application/x-www-form-urlencoded")).Result;