From 6f23780232dd340d29dd6d5741eac729948af997 Mon Sep 17 00:00:00 2001
From: Gonzalo Odiard <godiard@sugarlabs.org>
Date: Tue, 05 Oct 2010 11:36:47 +0000
Subject: fix #10365. Only backport solution from Browse in Sugar 0.90

---
diff --git a/downloadmanager.py b/downloadmanager.py
index e41d06f..dd75783 100644
--- a/downloadmanager.py
+++ b/downloadmanager.py
@@ -308,9 +308,12 @@ def save_link(url, text, owner_document):
         interfaces.nsIRequest.LOAD_BYPASS_CACHE | \
         interfaces.nsIChannel.LOAD_CALL_CONTENT_SNIFFERS
 
-    if _implements_interface(channel, interfaces.nsIHttpChannel):
-        channel.referrer = io_service.newURI(owner_document.documentURI, None,
-                                             None)
+    # HACK: when we QI for nsIHttpChannel on objects that implement
+    # just nsIChannel, pyxpcom gets confused trac #1029
+    if uri.scheme == 'http':
+        if _implements_interface(channel, interfaces.nsIHttpChannel):
+            channel.referrer = io_service.newURI(owner_document.documentURI, 
+                                             None, None)
 
     # kick off the channel with our proxy object as the listener
     listener = xpcom.server.WrapObject(
--
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