Comment 5 for bug 1505273

Through debugging the issue with Alexander Lemeshko, it has been observed
that the failed HTTP request isn't even delivered to radosgw instance - Apache
simply rejects it before passing through FastCGI.

radosgw does support chunked upload [1].

[1] https://github.com/ceph/ceph/blob/master/src/rgw/rgw_rest_swift.cc#L532