process

# File actionpack/lib/action_controller/integration.rb, line 258
        def process(method, path, parameters = nil, headers = nil)
          data = requestify(parameters)
          path = interpret_uri(path) if path =~ %r{://}
          path = "/#{path}" unless path[0] == ?/
          @path = path
          env = {}

          if method == :get
            env["QUERY_STRING"] = data
            data = nil
          end

          env["QUERY_STRING"] ||= ""

          data ||= ''
          data.force_encoding(Encoding::ASCII_8BIT) if data.respond_to?(:force_encoding)
          data = data.is_a?(IO) ? data : StringIO.new(data)

          env.update(
            "REQUEST_METHOD"  => method.to_s.upcase,
            "SERVER_NAME"     => host,
            "SERVER_PORT"     => (https? ? "443" : "80"),
            "HTTPS"           => https? ? "on" : "off",
            "rack.url_scheme" => https? ? "https" : "http",
            "SCRIPT_NAME"     => "",

            "REQUEST_URI"    => path,
            "PATH_INFO"      => path,
            "HTTP_HOST"      => host,
            "REMOTE_ADDR"    => remote_addr,
            "CONTENT_TYPE"   => "application/x-www-form-urlencoded",
            "CONTENT_LENGTH" => data ? data.length.to_s : nil,
            "HTTP_COOKIE"    => encode_cookies,
            "HTTP_ACCEPT"    => accept,

            "rack.version"      => [0,1],
            "rack.input"        => data,
            "rack.errors"       => StringIO.new,
            "rack.multithread"  => true,
            "rack.multiprocess" => true,
            "rack.run_once"     => false
          )

          (headers || {}).each do |key, value|
            key = key.to_s.upcase.gsub(/-/, "_")
            key = "HTTP_#{key}" unless env.has_key?(key) || key =~ /^HTTP_/
            env[key] = value
          end

          [ControllerCapture, ActionController::ProcessWithTest].each do |mod|
            unless ActionController::Base < mod
              ActionController::Base.class_eval { include mod }
            end
          end

          ActionController::Base.clear_last_instantiation!

          app = Rack::Lint.new(@application)
          status, headers, body = app.call(env)
          @request_count += 1

          @html_document = nil

          @status = status.to_i
          @status_message = StatusCodes::STATUS_CODES[@status]

          @headers = Rack::Utils::HeaderHash.new(headers)

          cookies = @headers['Set-Cookie']
          cookies = cookies.to_s.split("\n") unless cookies.is_a?(Array)
          cookies.each do |cookie|
            name, value = cookie.match(/^([^=]*)=([^;]*);/)[1,2]
            @cookies[name] = value
          end

          @body = ""
          if body.respond_to?(:to_str)
            @body << body
          else
            body.each { |part| @body << part }
          end

          if @controller = ActionController::Base.last_instantiation
            @request = @controller.request
            @response = @controller.response
            @controller.send(:set_test_assigns)
          else
            # Decorate responses from Rack Middleware and Rails Metal
            # as an Response for the purposes of integration testing
            @response = Response.new
            @response.status = status.to_s
            @response.headers.replace(@headers)
            @response.body = @body
          end

          # Decorate the response with the standard behavior of the
          # TestResponse so that things like assert_response can be
          # used in integration tests.
          @response.extend(TestResponseBehavior)

          body.close if body.respond_to?(:close)

          return @status
        rescue MultiPartNeededException
          boundary = "----------XnJLe9ZIbbGUYtzPQJ16u1"
          status = process(method, path,
            multipart_body(parameters, boundary),
            (headers || {}).merge(
              {"CONTENT_TYPE" => "multipart/form-data; boundary=#{boundary}"}))
          return status
        end