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# File lib/rack/handler/webrick.rb, line 58
      def service(req, res)
        res.rack = true
        env = req.meta_vars
        env.delete_if { |k, v| v.nil? }

        rack_input = StringIO.new(req.body.to_s)
        rack_input.set_encoding(Encoding::BINARY) if rack_input.respond_to?(:set_encoding)

        env.update({"rack.version" => Rack::VERSION,
                     "rack.input" => rack_input,
                     "rack.errors" => $stderr,

                     "rack.multithread" => true,
                     "rack.multiprocess" => false,
                     "rack.run_once" => false,

                     "rack.url_scheme" => ["yes", "on", "1"].include?(env["HTTPS"]) ? "https" : "http",

                     "rack.hijack?" => true,
                     "rack.hijack" => lambda { raise NotImplementedError, "only partial hijack is supported."},
                     "rack.hijack_io" => nil,
                   })

        env["HTTP_VERSION"] ||= env["SERVER_PROTOCOL"]
        env[QUERY_STRING] ||= ""
        unless env[PATH_INFO] == ""
          path, n = req.request_uri.path, env["SCRIPT_NAME"].length
          env[PATH_INFO] = path[n, path.length-n]
        end
        env["REQUEST_PATH"] ||= [env["SCRIPT_NAME"], env[PATH_INFO]].join

        status, headers, body = @app.call(env)
        begin
          res.status = status.to_i
          headers.each { |k, vs|
            next if k.downcase == "rack.hijack"

            if k.downcase == "set-cookie"
              res.cookies.concat vs.split("\n")
            else
              # Since WEBrick won't accept repeated headers,
              # merge the values per RFC 1945 section 4.2.
              res[k] = vs.split("\n").join(", ")
            end
          }

          io_lambda = headers["rack.hijack"]
          if io_lambda
            rd, wr = IO.pipe
            res.body = rd
            res.chunked = true
            io_lambda.call wr
          elsif body.respond_to?(:to_path)
            res.body = ::File.open(body.to_path, 'rb')
          else
            body.each { |part|
              res.body << part
            }
          end
        ensure
          body.close  if body.respond_to? :close
        end
      end