class HTTP::Client

def perform(req, options)
  verify_connection!(req.uri)
  @state = :dirty
  begin
    @connection ||= HTTP::Connection.new(req, options)
    unless @connection.failed_proxy_connect?
      @connection.send_request(req)
      @connection.read_headers!
    end
  rescue Error => e
    options.features.each_value do |feature|
      feature.on_error(req, e)
    end
    raise
  end
  res = build_response(req, options)
  res = options.features.inject(res) do |response, (_name, feature)|
    feature.wrap_response(response)
  end
  @connection.finish_response if req.verb == :head
  @state = :clean
  res
rescue
  close
  raise
end