diff --git a/Lib/urllib2.py b/Lib/urllib2.py
index 3ad0b15..91c632c 100644
--- a/Lib/urllib2.py
+++ b/Lib/urllib2.py
@@ -531,8 +531,11 @@
             # do the same.
             # be conciliant with URIs containing a space
             newurl = newurl.replace(' ', '%20')
+            newheaders = dict((k,v) for k,v in req.headers.items()
+                              if k.lower() not in ("content-length", "content-type")
+                             )
             return Request(newurl,
-                           headers=req.headers,
+                           headers=newheaders,
                            origin_req_host=req.get_origin_req_host(),
                            unverifiable=True)
         else: