connection_for

# File lib/bundler/vendor/net-http-persistent/lib/net/http/persistent.rb, line 588
  def connection_for uri
    Thread.current[@generation_key]     ||= Hash.new { |h,k| h[k] = {} }
    Thread.current[@ssl_generation_key] ||= Hash.new { |h,k| h[k] = {} }
    Thread.current[@request_key]        ||= Hash.new 0
    Thread.current[@timeout_key]        ||= Hash.new EPOCH

    use_ssl = uri.scheme.downcase == 'https'

    if use_ssl then
      raise Bundler::Persistent::Net::HTTP::Persistent::Error, 'OpenSSL is not available' unless
        HAVE_OPENSSL

      ssl_generation = @ssl_generation

      ssl_cleanup ssl_generation

      connections = Thread.current[@ssl_generation_key][ssl_generation]
    else
      generation = @generation

      cleanup generation

      connections = Thread.current[@generation_key][generation]
    end

    net_http_args = [uri.host, uri.port]
    connection_id = net_http_args.join ':'

    if @proxy_uri and not proxy_bypass? uri.host, uri.port then
      connection_id << @proxy_connection_id
      net_http_args.concat @proxy_args
    else
      net_http_args.concat [nil, nil, nil, nil]
    end

    connection = connections[connection_id]

    unless connection = connections[connection_id] then
      connections[connection_id] = http_class.new(*net_http_args)
      connection = connections[connection_id]
      ssl connection if use_ssl
    else
      reset connection if expired? connection
    end

    start connection unless connection.started?

    connection.read_timeout = @read_timeout if @read_timeout
    connection.keep_alive_timeout = @idle_timeout if @idle_timeout && connection.respond_to?(:keep_alive_timeout=)

    connection
  rescue Errno::ECONNREFUSED
    address = connection.proxy_address || connection.address
    port    = connection.proxy_port    || connection.port

    raise Error, "connection refused: #{address}:#{port}"
  rescue Errno::EHOSTDOWN
    address = connection.proxy_address || connection.address
    port    = connection.proxy_port    || connection.port

    raise Error, "host down: #{address}:#{port}"
  end