Task<HttpResponse<MyClass>> response = Unirest.post(API_URL)
.header("X-RapidAPI-Key", API_KEY)
.header("Content-Type", "application/x-www-form-urlencoded")
.asJson();

Task<HttpResponse<MyClass>> myClassTask = Unirest.post(API_URL)
  .header("X-RapidAPI-Key", API_KEY)
  .header("Content-Type", "application/x-www-form-urlencoded")
  .asJsonAsync<MyClass>();

Task<HttpResponse<MyClass>> response = Unirest.post(API_URL)
  .header("X-RapidAPI-Key", API_KEY)
  .header("Content-Type", "application/x-www-form-urlencoded")
  .field("content", File.ReadAllBytes(@"/path/to/file"))
  .asJson();