# File lib/aws/core/http/connection_pool.rb, line 62
        def initialize options = {}
          # user supplied options are filtered by the class .for method
          options.each_pair do |opt_name, opt_value|
            instance_variable_set("@#{opt_name}", opt_value)
          end

          # connection pool
          @pool_mutex = Mutex.new
          @pool = Hash.new do |pool,endpoint|
            pool[endpoint] = []
            pool[endpoint]
          end
        end