> Ok, but in this case thing I want is to have some stale data in cache
> ("old" pages without 404 reply and other errors).

I'm not sure what you mean.  Polipo puts *everything* in the cache (with
a minor exception for ``cache-control: no-store'').

Perhaps you're looking for relaxTransparency (see Section 4.1.2 in the
manual)?

> rfc2616 tells pages with "Cache-Control: private" cannot be cached by
> shared cache, but it is so in this case. Is it a kind of optimizing,
> or rfc means some other caching too?

I believe that the RFC is confused.  It makes a distinction between
``must not store'', ``must not cache'' and ``must revalidate''.  I've
tried to find a logic to the latter distinction, and I couldn't find
one.

Polipo treats both ``must revalidate'' and ``must not cache'' as ``must
revalidate''.  As to ``must not store'', it is clearly impossible to
implement (do your network buffers count as storage?), so Polipo
interprets it as ``must not store on disk''.

                                        Juliusz

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