[Zope] ZServerHTTPResponse instance has no attribute 'SetHeader'

Hi, I found the following snippet of pythonscript in a howto. document=context.thesqlquery() container.REQUEST.RESPONSE.SetHeader('content-type','application/pdf') return document[0].Test10 The idea is fetching an PDF document from an MySQL database. But I get the error: ZServerHTTPResponse instance has no attribute 'SetHeader' Any ideas? Henny