[Zope] Zope and chunked Transfer-Encoding problem

Hello ppl, Could anyone tell me whether Zope 2.5.1 supports Transfer-Encoding: chunked feauture of HTTP/1.1 for handling client request, such as sending a decent amount of data, e.g. file upload? I get Bad Request error with response code 400. I am pretty confident about the request correctness itself. Thanks, A.Z.