[Rails] [Rails 3.2] REXML::ParseException ... invalid byte sequence in UTF-8

[Erwin]

when parsing an xml response  ( UTF-8 encoding) I get a parsing error

response =>
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<rss xmlns:opensearch=
\"http://a9.com/-/spec/opensearch/1.1/\"; xmlns:dc=\"http://purl.org/dc/
elements/1.1/\" version=\"2.0\">\n  <channel>\n    <title>link:http://
lvh.me:3000 - Google Recherche de blogs</title>\n    <link>http://
www.google.com/search?q=link:http://lvh.me:3000&amp;tbm=blg</link>\n
<description>Aucun document ne correspond aux termes de recherche sp
\xE9cifi\xE9s (&lt;b&gt;link:http://lvh.me:3000&lt;/b&gt;).</
description>\n    <opensearch:totalResults>0</opensearch:totalResults>
\n    <opensearch:startIndex>1</opensearch:startIndex>\n
<opensearch:itemsPerPage>10</opensearch:itemsPerPage>\n  </channel>\n</
rss>"


parse_rss(response)

 def parse_rss(body)
      xml = REXML::Document.new(body)
REXML::ParseException Exception: #<REXML::ParseException:
#<ArgumentError: invalid byte sequence in UTF-8>

which seems to be raised  by the  <description> tag with a french text
using accentuated characters... like    sp\xE9cifi\xE9s

is it an REXML bug ? ( in this case I may switch to Nokogiri...)
 or did I missed any mandatory parameter in my request ?


thanks for your feedback

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