On 9/12/05, Neil Schemenauer  wrote:
> [This message has also been posted.]
> Mike Orr  wrote:
> > The problem is that if you view one category (list of entries),
> > then go back and view another, on some browsers you see the first
> > category again.  Then if you hit Refresh it shows the correct
> > category.  It seems to be a problem with browser caching.
>
> Which browsers?  Is there some kind of pattern?

Firefox, IE, Safari, and Netscape 7 at least.  Not Konqueror.  It
doesn't always happen, but when it does it keeps happening several
times in a row.  It migrates sites too, sometimes on one, sometimes on
the other, even though they're derived from the same codebase.

> > I looked through the HTTP RFC and http_response.py, and it looks like
> > it doesn't cache by default but somehow it is.  self.cache is 0, which
> > seems to translate to "Expires: -1", but my browser (Firefox) says
> > "Expires: not specified".  I'd like to put "Expires: 0" but it looks
> > like I'd have to hack the Publisher to do so.  I figured I'd ask here
> > first.
>
> "Expires: -1" should do the right thing.

I verified it is generating "Expires: -1" when the problem occurs.  I
hacked http_response.generate_headers() to set "Expires: 0" instead
but it didn't make any difference.  Firefox in its info box says
"Expires: (no expiration set)" either way.  Konqueror is more
explicit::

Cache-Control    max-age=60
Expires               -1   (or 0)
Expires              

I'm going to rearrange the URLs as David suggested ( /1/categories/4 )
and do the query for every page.  That means several more Directories,
but it should bypass the problem, at least until we have a general
search screen.  Then it won't be practical to have a distinct URL for
every type of search.

The problem is easy to work around by pressing the Refresh button, but
that's unreasonable to expect of users.

--
Mike Orr  or