connection_for

# File lib/rubygems/request.rb, line 73
  def connection_for(uri)
    net_http_args = [uri.host, uri.port]

    if @proxy_uri and not no_proxy?(uri.host) then
      net_http_args += [
        @proxy_uri.host,
        @proxy_uri.port,
        Gem::UriFormatter.new(@proxy_uri.user).unescape,
        Gem::UriFormatter.new(@proxy_uri.password).unescape,
      ]
    end

    connection_id = [Thread.current.object_id, *net_http_args].join ':'

    connection = @connections_mutex.synchronize do
      @connections[connection_id] ||= Net::HTTP.new(*net_http_args)
      @connections[connection_id]
    end

    if https?(uri) and not connection.started? then
      configure_connection_for_https(connection)
    end

    connection.start unless connection.started?

    connection
  rescue defined?(OpenSSL::SSL) ? OpenSSL::SSL::SSLError : Errno::EHOSTDOWN,
         Errno::EHOSTDOWN => e
    raise Gem::RemoteFetcher::FetchError.new(e.message, uri)
  end