MultipartEntityBuilder: Omit Content-Type and Content-Transfer

What I want (what my chrome browser does):

POST .../some.jsp HTTP/1.1
Host: ...
Connection: keep-alive
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary6tcnkxC7txvqE5Xl


------WebKitFormBoundary6tcnkxC7txvqE5Xl
Content-Disposition: form-data; name="merkmal"

5

What I get from MultipartEntityBuilder

POST.../some.jsp HTTP/1.1
Host: ...
Content-Type: multipart/form-data; boundary=m9Zb2QD-QaH-j-HqgGQfI8KwDkToz17ULYkZ

--m9Zb2QD-QaH-j-HqgGQfI8KwDkToz17ULYkZ
Content-Disposition: form-data; name="merkmal"
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit

===>

 lright - intense googeling finally produced an answer.

1) There are apparently some servers that do not get on well with the "Content-Transfer-Encoding" header.
2) There is a browser compatibility mode in HttpComponents that is used like this:
MultipartEntityBuilder uploadEntityBuilder = MultipartEntityBuilder.create().setMode(HttpMultipartMode.BROWSER_COMPATIBLE);