Use x-internal-response header instead.
Checking in changes prior to tagging of version 2.05.

Changelog diff is:

diff --git a/Changes b/Changes
index d92dad0..719627e 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,13 @@
 Revision history for Perl extension Furl

+2.05 2013-02-12T15:00:31
+
+    [EXPERIMENTAL FEATURE]
+    - Add "X-Internal-Respponse: 1" header for
+      Internal response. It's compatible with LWP.
+      (tokuhirom)
+    - Reverted Client-Warning header introduced in 2.04
+
 2.04 2013-02-12T14:28:53

     [EXPERIMENTAL FEATURE]