Index: Lib/httplib.py
===================================================================
--- Lib/httplib.py	(revision 60122)
+++ Lib/httplib.py	(working copy)
@@ -438,7 +438,11 @@
             try:
                 self.length = int(length)
             except ValueError:
-                self.length = None
+                pass
+
+            if self.length < 0:
+               self.length = None
+
         else:
             self.length = None