I've a very simple pipe:
and I get this:
warning Error fetching http://hardverapro.hu/aprok/hardver/halozati_termekek/wireless_eszkozok/?rss=true. Response: OK (200). Error: Invalid XML document. Root cause: org.xml.sax.SAXParseException; Premature end of file.
The rss url itself displays just fine in the browser, and any rss reader can work with it.
What is wrong with it thhen?
I think the trouble is with the <![CDATA[ ... ]]> markups in your feed. Open the feed in an advanced text editor, and you'll see those marks.
<![CDATA[ ... ]]>
you could try using the XPath fetch page instead, but in this case it would seem that inside one (or more) of the <![CDATA[ there is characters that are interpreted as end of file/feed.