Posting JSON to WebAPI2 function - json

Question

I have the following code in an MVC app controller to send some data to be stored in an Archive table using EF6 via a WebAPI2 call.
I'm getting a "Cannot send a content-body with this verb-type" even though I'm setting to POST and the api call is defined to accept only POST.
What in the world am I doing wrong and how can I fix it?
ArchiveUploadModel.ArchiveUpload obj = new ArchiveUploadModel.ArchiveUpload();
obj.LT = LT;
obj.PID = PID.ToString();
obj.Title = "Ex Review";
obj.HTML = message.Body; // the HTML is a rendered HTML email message
if (!string.IsNullOrEmpty(obj.HTML))
{
HttpWebRequest req = HttpWebRequest.Create("http://example.com/MyApp/api/UploadToArchive") as HttpWebRequest;
request.ContentType = "application/json";
request.Method = "POST";
string json = JsonConvert.SerializeObject(obj);
using (var streamWriter = new StreamWriter(request.GetRequestStream()))
{
streamWriter.Write(json);
streamWriter.Flush();
streamWriter.Close();
}
}
using (HttpWebResponse webresponse = request.GetResponse() as HttpWebResponse)
{
using (StreamReader reader = new StreamReader(webresponse.GetResponseStream()))
{
string response = reader.ReadToEnd();
}
}
This is the code for my WebAPI call:
[HttpPost]
[Route("api/UploadToArchive")]
[EnableCors("http://example.com", // Origin
"Accept, Origin, Content-Type, Options", // Request headers
"POST", // HTTP methods
PreflightMaxAge = 600 // Preflight cache duration
)]
public IHttpActionResult UploadToArchive(ArchiveUpload upload)
{
string HTML = upload.HTML;
string Title = upload.Title;
string LT = upload.LT;
string lt = getLT(upload.PID); // essentially secure checking to see if it matches passed LT.
if (lt == LT)
{
// Upload the file to the archive using the ArchiveRepository's UpdateArchive() function:
_ArchiveRepository.UpdateArchive(HTML, System.Web.HttpUtility.HtmlDecode(Title), "", upload.PID);
return Ok(PID);
}
else
{
return BadRequest("Invalid LT");
}
}
ArchiveUpload model definition in both applications:
public class ArchiveUpload
{
public string LT { get; set; }
public string PID { get; set; }
public string Title { get; set; }
public string HTML { get; set; }
}

Answer 1

Better try to use the Microsoft Http Client Libraries. You can install it from nuget and here you find examples calling Web API using different HTTP verbs