# File lib/aws/core/http/handler.rb, line 23
        def initialize(base, &block)
          @base = base
          if base.respond_to?(:handle)
  
            unless block.arity == 2
              raise ArgumentError, 'passed block must accept 2 arguments'
            end
            MetaUtils.extend_method(self, :handle, &block)
  
          elsif base.respond_to?(:handle_async)
  
            unless block.arity == 3
              raise ArgumentError, 'passed block must accept 3 arguments'
            end
  
            MetaUtils.extend_method(self, :handle_async) do |req, resp, handle|
              @base.handle_async(req, resp, handle)
            end
            MetaUtils.extend(self) do
              define_method(:handle) do |req, resp|
                raise "attempted to call #handle on an async handler"
              end
              define_method(:handle_async, &block)
            end
  
          else
            raise ArgumentError, 'base must respond to #handle or #handle_async'
          end
        end