open
read
doRead: abc|i:123;
destroy
doDestroy
close
open
validateId
read
doRead: invalid sessionId
read

write
doWrite: abc|i:123;
close
Array
(
    [0] => Content-Type: text/plain; charset=utf-8
    [1] => Cache-Control: max-age=10800, private, must-revalidate
    [2] => Set-Cookie: sid=random_session_id; path=/; secure; HttpOnly
)
shutdown