module ActionDispatch module Http class Headers CGI_VARIABLES = %w( CONTENT_TYPE CONTENT_LENGTH HTTPS AUTH_TYPE GATEWAY_INTERFACE PATH_INFO PATH_TRANSLATED QUERY_STRING REMOTE_ADDR REMOTE_HOST REMOTE_IDENT REMOTE_USER REQUEST_METHOD SCRIPT_NAME SERVER_NAME SERVER_PORT SERVER_PROTOCOL SERVER_SOFTWARE ) HTTP_HEADER = /\A[A-Za-z0-9-]+\z/ include Enumerable attr_reader :env def initialize(env = {}) @env = env end def [](key) @env[env_name(key)] end def []=(key, value) @env[env_name(key)] = value end def key?(key); @env.key? key; end alias :include? :key? def fetch(key, *args, &block) @env.fetch env_name(key), *args, &block end def each(&block) @env.each(&block) end def merge(headers_or_env) headers = Http::Headers.new(env.dup) headers.merge!(headers_or_env) headers end def merge!(headers_or_env) headers_or_env.each do |key, value| self[env_name(key)] = value end end private def env_name(key) key = key.to_s if key =~ HTTP_HEADER key = key.upcase.tr('-', '_') key = "HTTP_" + key unless CGI_VARIABLES.include?(key) end key end end end end