[Zope] REQUEST.setHeader doesn't seem to work?

Hi, I have a dtml file on FSDV which should return a file in text/plain format. The dtml method starts with: <dtml-call expr="RESPONSE.setHeader('content-type', 'text/plain')"> ... some content ... However, when I use 'curl -I' to check which Content-Type header is returned, I find it is still 'text/html', despite the call to setHeader. Where could the problem lie? I am using Zope 2.7.6, with Apache configured as frontend (with rewrite enabled). Could it be caused by Apache? -- Hong Yuan 大管家网上建材超市 www.homemaster.cn