Binary upload with headers

Hi,

I'm trying upload an image using the WWWForm class, but I also need to add a cookie to the header for my session authentication. For a normal POST request this works fine, but when I add binary data into it, it doesn't work.

My code is as follows:

Code (csharp):

1.  
2. private static WWW BuildRequest(string path, Dictionary<string, string> paramList = null, byte[] binaryData = null)
3.     {
4.         string url = string.Format("{0}{1}/?t={2}", apiUrl, path, Utils.UnixTimeStampUTC());
5.         if (paramList != null && binaryData == null)
6.         {
7.             WWWForm postForm = new WWWForm();
8.             foreach (var key in paramList.Keys)
9.             {
10.                 postForm.AddField(key, paramList[key]);
11.             }
12.  
13.             var jar = SessionCookie();
14.             var headers = postForm.headers;
15.  
16.             foreach (var i in jar.Keys)
17.             {
18.                 headers.Add(i, jar[i]);
19.             }
20.  
21.             if(binaryData != null)
22.                 postForm.AddBinaryData("image_data", binaryData, "screenshot.png", "image/png");
23.  
24.             return new WWW(url, postForm.data, headers);
25.         }
26.         else
27.         {
28.             return new WWW(url, null, SessionCookie());
29.         }
30.     }
31.  

The only way I can get it to work is to change this:

Code (csharp):

1.  
2. return new WWW(url, postForm.data, headers);
3.  

to this:

Code (csharp):

1.  
2. return new WWW(url, postForm);
3.  

But that doesn't allow me to pass my extra headers in then.

I've used Charles to look at the differences and when I pass in my header, my content type is appliction/x-www-form-urlencoded, but when I don't pass any headers in, the content type is multipart/form-data;

Am I doing some thing wrong here?