Only decode HTML pages in 3.x.

--HG--
branch : distribute
extra : rebase_source : 58a286fe297947272398fc9ddd8f50594f54d4ae

setuptools/package_index.py

@@ -197,8 +197,9 @@ class PackageIndex(Environment):
 
         base = f.url     # handle redirects
         page = f.read()
-        charset = f.headers.get_param('charset') or 'latin-1'
-        page = page.decode(charset, "ignore")
+        if sys.version_info >= (3,):
+            charset = f.headers.get_param('charset') or 'latin-1'
+            page = page.decode(charset, "ignore")
         f.close()
         if url.startswith(self.index_url) and getattr(f,'code',None)!=404:
             page = self.process_index(url, page)