Index: smart/fetcher.py
===================================================================
--- smart/fetcher.py	(revision 896)
+++ smart/fetcher.py	(working copy)
@@ -487,11 +487,15 @@
         # - size: file size
         # - uncomp: whether to uncompress or not
         # - uncomp_{md5,sha,size}: uncompressed equivalents
+        # - http_headers: extra http headers needed for the download request
         #
-        for kind in ("md5", "sha", "uncomp_md5", "uncomp_sha"):
+        for kind in ("md5", "sha", "uncomp_md5", "uncomp_sha", "http_headers"):
             value = info.get(kind)
             if value:
-                info[kind] = value.lower()
+                try:
+                    info[kind] = value.lower()
+                except AttributeError:
+                    pass
         self._info.update(info)
 
     def start(self):
@@ -1171,6 +1175,12 @@
                 else:
                     partsize = 0
 
+                extraheaders = item.getInfo("http_headers")
+                if extraheaders:
+                    for key in extraheaders.keys():
+                        value = extraheaders[key]
+                        opener.addheader(key, "%s" % value)
+ 
                 remote = opener.open(url.original)
 
                 if hasattr(remote, "errcode") and remote.errcode == 416: