[xwiki-users] buffering?

Hello XWiki experts, I'm implementing OAI-PMH, a service infrastructure to aggregate digital library items. I do so with a few velocity pages and a groovy page. I'll happily share it. At first, I did not implement the "resumption" flow-control, which allows a big search list to be paged in several requests as I expected the output of my velocity script to trigger a buffer-full and start delivering the packets down the line. But this fails, nothing comes before it's finished. And indeed, I receive a content-length header... so there is buffering happening somewhere. Do I have a possibility to disable velocity output buffering? Paul