[Nitro] Error when using lighttpd + Nitro file caching

[Jonathan Buch]

Hi,

> possible cases:
>
> 1. File doesn't exist:
> Suggestion: Session has expired, create a new file.
>
> 2. File exists but is unreadable (existing session)
> Suggestion: This could happen if the session file gets corrupted somehow.
> Create a new file.
>
> 3. File exists but is unwritable (existing session)
> Suggestion: Same as 2.

this specification sounds good to me!  I'd be glad if you could implement
it like this.  :D

Caching is the unbeloved stepchild anyway, good someone gives that a little
lovin' :P

Jo

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