mutlpart/mixed response with Web Api

gistfile1.cs

public class TestController : ApiController {

  //illustrates how to return multipart/mixed content: http://www.w3.org/Protocols/rfc1341/7_2_Multipart.html
  private HttpResponseMessage Get()
  {
      var friend = GetFriend();
      var friendContent = new ObjectContent<Friend>(friend, new JsonMediaTypeFormatter());
      var response = new HttpResponseMessage();
      
      //create the multipart content and specify the boundary
      var multipartContent = new MultipartContent("mixed", "AaB03x");
      
      //add the friend document
      multipartContent.Add(friendContent);
      
      //grab the path for the image and open a stream
      var imagePath = GetFilePath(@"images/mamund.jpg");
      var file = File.OpenRead(imagePath);
      
      //create the content for the image. 
      var streamContent = new StreamContent(file);

      //set the content type
      streamContent.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg");
      
      //create the disposition header
      var disposition = new ContentDispositionHeaderValue("attachment");
      disposition.FileName = "mamund.jpg";
      streamContent.Headers.ContentDisposition = disposition;
      
      //set the encoding
      streamContent.Headers.ContentEncoding.Add("binary");
      
      //add the image content to the multipart content
      multipartContent.Add(streamContent);
      
      //set the response content and return it
      response.Content = multipartContent;
      return response;
  }
  
  private string GetFilePath(string sitePath) {  
    //implement logic to return the path on disk. On IIS you can use Server.MapPath.
  }
}