# File lib/webmock/http_lib_adapters/httpclient_adapter.rb, line 257
  def headers_from_session(uri)
    session_headers = HTTP::Message::Headers.new
    @session_manager.send(:open, uri).send(:set_header, MessageMock.new(session_headers))
    session_headers.all.inject({}) do |hdrs, header|
      hdrs[header[0]] = header[1]
      hdrs
    end
  end