merges r30452 from trunk into ruby_1_9_2.

--
* lib/net/http.rb (Net::HTTP#get): A header hash given should not
  be modified.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30564 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/net/http.rb b/lib/net/http.rb
index 5407975851..8abbf60e58 100644
--- a/lib/net/http.rb
+++ b/lib/net/http.rb
@@ -873,7 +873,9 @@ module Net   #:nodoc:
       res = nil
       if HAVE_ZLIB
         unless  initheader.keys.any?{|k| k.downcase == "accept-encoding"}
-          initheader["accept-encoding"] = "gzip;q=1.0,deflate;q=0.6,identity;q=0.3"
+          initheader = initheader.merge({
+            "accept-encoding" => "gzip;q=1.0,deflate;q=0.6,identity;q=0.3"
+          })
           @compression = true
         end
       end