Help posting .wav file in http request with HttpPost

[Ariada Smith]

Im trying to post a .wav file in the http request.. Im getting an access token but the status code is 500.. Can you see anything Im doing wrong? Am I building the request wrong? Any help would be greatly appreciated!!

if(SpeechToText!=null){
     DiskFileUpload fu = new DiskFileUpload();
        List fileItems = fu.parseRequest(request);
        Iterator itr = fileItems.iterator();
        
     while(itr.hasNext()) {
          FileItem fi = (FileItem)itr.next();
          if(!fi.isFormField()) {
                File fNew = new File(application.getRealPath("/"), fi.getName());
                fileName = fileName + fi.getName();
                if(!(fi.getName().equalsIgnoreCase(""))){
                    fi.write((fNew));
                }
          }
        }

     File file = new File(application.getRealPath("/") + fileName);
     MultipartEntity mpEntity = new MultipartEntity();
     ContentBody cbFile = new FileBody(file, "audio/wav");
     DefaultHttpClient httpclient = new DefaultHttpClient();
     HttpPost httppost = new HttpPost(url);
     mpEntity.addPart("file", cbFile);
     httppost.setEntity(mpEntity);	//sets the body
     httppost.addHeader("Authorization","Bearer " + accessToken);
     httppost.addHeader("Content-Type","audio/wav");
     httppost.addHeader("Accept","application/json");

     HttpResponse responze = httpclient.execute(httppost);
       
     int statusCode = responze.getStatusLine().getStatusCode();

     if(statusCode == 200){
        ............