Download file from Android to .Net Web API using the Android asynchronous Http client library

Question

I am trying to upload an image to an ASP.NET RESTful Web API from an Android client. For this, I use the Asynchronous Http Android library .

I expect the title to be similar to the title.

POST http://localhost:50460/api/values/1 HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------41184676334
Content-Length: 29278

-----------------------------41184676334
Content-Disposition: form-data; name="caption"

Summer vacation
-----------------------------41184676334
Content-Disposition: form-data; name="image1"; filename="GrandCanyon.jpg"
Content-Type: image/jpeg

(Binary data not shown)
-----------------------------41184676334--

My problem is that the request I am making is not multi-page, and therefore I always throw an unsupported media type exception.

Below is my .NET code.

public Task<Guid> Upload([)
{
    Guid userGuid;

    // Check if the request contains multipart/form-data
    // or if the extension is valid
    if (!Request.Content.IsMimeMultipartContent())
    {
        throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType);
        return null;
    }

    var provider = new CustomMultipartFormDataStreamProvider(UPLOAD_PATH);

    // Read the form data and return an async task.
    var task = Request.Content.ReadAsMultipartAsync(provider).
        ContinueWith<Guid>(t =>
        {   
            // mode code

            foreach (MultipartFileData file in provider.FileData)
            {
                filename = file.Headers.ContentDisposition.FileName;

                // ... more code
            }

            return guid;
        });

    return task;
}

I also tried something like this: Request.Content.IsMimeMultipartContent("form-data")

I created the HTML client using jQuery and I can easily load it into the REST service. It makes me believe that there is something in my Android code that I don’t see. This is what my Java method looks like:

File file = new File([path to your file]);

MimeTypeMap map = MimeTypeMap.getSingleton();
String ext = FilenameUtils.getExtension(file.getName());
String mime_type = map.getMimeTypeFromExtension(ext);

MultipartEntity form = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE, this);
form.addPart("file-data", new FileBody(file, mime_type, "UTF-8"));

AsyncHttpClient client = new AsyncHttpClient();
client.post(context, [your url], form, mime_type, responseHandler) ;

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