urlfetch.rb.patch

diff -r 1256a3ece94f appengine-apis/lib/appengine-apis/urlfetch.rb
--- a/appengine-apis/lib/appengine-apis/urlfetch.rb     Tue May 04 10:42:56 2010 -0700
+++ b/appengine-apis/lib/appengine-apis/urlfetch.rb     Wed May 05 16:07:24 2010 +0900
@@ -142,7 +142,7 @@
 
       if payload
         if headers["Content-Length"].to_i != payload.size
-          headers["Content-Length"] = payload.size
+          headers["Content-Length"] = payload.size.to_s
         end
       end