def update_options env, options
        if options[:method] and (ALLOWED_METHODS | ALLOWED_METHODS_PRIVATE).include?(options[:method])
          # (possibly) TODO - pass parameters for GET instead of POST in update_params then?
          # see https://github.com/rack/rack/blob/master/lib/rack/request.rb -> def GET
          env[METHOD] = options[:method]
        end
      end
def update_options env, options
        if options[:method] and (ALLOWED_METHODS | ALLOWED_METHODS_PRIVATE).include?(options[:method])
          # (possibly) TODO - pass parameters for GET instead of POST in update_params then?
          # see https://github.com/rack/rack/blob/master/lib/rack/request.rb -> def GET
          env[METHOD] = options[:method]
        end
      end
updates the options