def _response(status, body=nil, headers={})
      body = [body].compact
      headers = headers.merge("Content-Type" => "application/json")
      Rack::Response.new(body, status, headers).finish
    end
def _response(status, body=nil, headers={})
      body = [body].compact
      headers = headers.merge("Content-Type" => "application/json")
      Rack::Response.new(body, status, headers).finish
    end
Returns a valid rack response.