request.rb in packetgen-2.5.0

- old
+ new

@@ -1,10 +1,12 @@
 # This file is part of PacketGen
 # See https://github.com/sdaubert/packetgen for more informations
 # Copyright (C) 2016 Sylvain Daubert <sylvain.daubert@laposte.net>
 # This program is published under MIT license.
 
+# frozen_string_literal: true
+
 module PacketGen
   module Header
     module HTTP
       # An HTTP/1.1 Request packet consits of:
       # * the http method ({Types::String}).
@@ -74,10 +76,10 @@
         # @return [String]
         def to_s
           raise FormatError, "Missing #method."  if self.method.empty?
           raise FormatError, "Missing #path."    if self.path.empty?
           raise FormatError, "Missing #version." if self.version.empty?
-          str = "" # build 'dat string
+          str = "".dup # build 'dat string
           str << self[:method] << " " << self[:path] << " " << self[:version] << "\r\n" << self[:headers].to_s
         end
       end
     end
 