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-rw-r--r--lib/yahns/http_response.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/yahns/http_response.rb b/lib/yahns/http_response.rb
index 99bf664..57910b0 100644
--- a/lib/yahns/http_response.rb
+++ b/lib/yahns/http_response.rb
@@ -1,6 +1,7 @@
 # -*- encoding: binary -*-
 # Copyright (C) 2013-2015 all contributors <yahns-public@yhbt.net>
 # License: GPLv3 or later (https://www.gnu.org/licenses/gpl-3.0.txt)
+# frozen_string_literal: true
 require_relative 'stream_file'
 require_relative 'wbuf_str'
 
@@ -134,7 +135,7 @@ module Yahns::HttpResponse # :nodoc:
       code = status.to_i
       msg = Rack::Utils::HTTP_STATUS_CODES[code]
       buf = "#{response_start}#{msg ? %Q(#{code} #{msg}) : status}\r\n" \
-            "Date: #{httpdate}\r\n"
+            "Date: #{httpdate}\r\n".dup
       headers.each do |key, value|
         case key
         when %r{\ADate\z}i