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-rw-r--r--lib/yahns/proxy_pass.rb5
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/yahns/proxy_pass.rb b/lib/yahns/proxy_pass.rb
index 728ab3e..c8eec84 100644
--- a/lib/yahns/proxy_pass.rb
+++ b/lib/yahns/proxy_pass.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 'socket'
 require 'kgio'
 require 'kcar' # gem install kcar
@@ -24,7 +25,7 @@ class Yahns::ProxyPass # :nodoc:
     # we must reinitialize the thread-local rbuf if it may get beyond the
     # current thread
     def detach_rbuf!
-      Thread.current[:yahns_rbuf] = ''
+      Thread.current[:yahns_rbuf] = ''.dup
     end
 
     def yahns_step # yahns event loop entry point
@@ -225,7 +226,7 @@ class Yahns::ProxyPass # :nodoc:
     end
 
     req = "#{env['REQUEST_METHOD']} #{req} #{ver}\r\n" \
-          "X-Forwarded-For: #{env["REMOTE_ADDR"]}\r\n"
+          "X-Forwarded-For: #{env["REMOTE_ADDR"]}\r\n".dup
 
     # pass most HTTP_* headers through as-is
     chunked = false