Re:Re: My opinions on nocache and nocache_hack. :-)

Thanks, Henrik pal!

I have read the codes,
    if (no_cache) {
#if HTTP_VIOLATIONS
        if (Config.onoff.reload_into_ims)
            request->flags.nocache_hack = 1;
        else if (refresh_nocache_hack)
            request->flags.nocache_hack = 1;
        else
#endif
            request->flags.nocache = 1;
    }

I think it means that in this case nocache and nocache_hack are not the same. For
example, in this case, nocache==true but Config.onoff.reload_into_ims==false, nocache
and nocache_hack are not the same. Am I correct?

In the pase time, I only notice the following two cases, so in my mind they are the same all
the time. :-) Now I think I have known in some cases they are not always the same.

    if (r->flags.nocache)
        ipcacheInvalidate(r->host);
#if HTTP_VIOLATIONS
    else if (r->flags.nocache_hack)
        ipcacheInvalidate(r->host);
......
if (r->flags.nocache || r->flags.nocache_hack) {

Best regards,
George Ma

----- Original Message -----
From: Henrik Nordstrom
To: maer727@sohu.com
Cc: squid-dev@squid-cache.org
Subject: Re: My opinions on nocache and nocache_hack. :-)
Sent: Sun Apr 28 16:43:13 CST 2002

> http://www.squid-cache.org/mail-archive/squid-dev/200204/0707.html
>
> On Sunday 28 April 2002 05:36, maer727@sohu.com wrote:
> > Thanks, Henrik pal!
> >
> > I search "no_cache" in squid.conf and do not find any rules.
> > What are the rules you mentioned?
> >
> > Another question, what means "may override the request"? Do you
> > mean in some cases even though the request asks the cache to remove
> > the object from cache, the object will still be kept in cache
> > without removing(so, it is on the contrary of the request)?
> >
> > Best regards,
> > George Ma
> >
> > ----- Original Message -----
> > From: Henrik Nordstrom
> > To: maer727@sohu.com
> > Cc: squid-dev@squid-cache.org
> > Subject: Re:Re: My opinions on nocache and nocache_hack. :-)
> > Sent: Sat Apr 27 22:00:36 CST 2002
> >
> > > No, they are not the same. Both indicates the user has requested
> > > the object must not be from the cache, but in case of
> > > nocache_hack there is squid.conf rules which may override the
> > > request.
> > >
> > > On Saturday 27 April 2002 14:20, maer727@sohu.com wrote:
> > > > Thanks, Henrik pal!
> > > >
> > > > I think nocache_hack means the cache should not cache the
> > > > object. I mean the meaning of no_cache and nocache_hack are the
> > > > same.
> > > >
> > > > Am I correct?
> > > >
> > > > Best regards,
> > > > George Ma
> > > >
> > > > ----- Original Message -----
> > > > From: Henrik Nordstrom
> > > > To: maer727@sohu.com
> > > > Cc: squid-dev@squid-cache.org
> > > > Subject: Re: My opinions on nocache and nocache_hack. :-)
> > > > Sent: Sat Apr 27 15:43:25 CST 2002
> > > >
> > > > > maer727@sohu.com wrote:
> > > > > > Hi, pals!
> > > > > >
> > > > > > After reading severals of source codes, I think
> > > > > > nocache_hack is the same as nocache if HTTP_VIOLATIONS is
> > > > > > defined. I have met with serveral cases where we treat the
> > > > > > two variables the same if HTTP_VIOLATIONS is defined.
> > > > > >
> > > > > > Am I correct?
> > > > >
> > > > > Not entirely. nocache_hack is a special mode of dealing with
> > > > > no_cache. See the following code segment from client_side.c
> > > > > where the two flags are set in the request:
> > > > >
> > > > > if (no_cache) {
> > > > > #if HTTP_VIOLATIONS
> > > > > if (Config.onoff.reload_into_ims)
> > > > > request->flags.nocache_hack = 1;
> > > > > else if (refresh_nocache_hack)
> > > > > request->flags.nocache_hack = 1;
> > > > > else
> > > > > #endif
> > > > > request->flags.nocache = 1;
> > > > > }
> > > > >
> > > > >
> > > > > Config.onoff.reload_into_ims and refresh_nocache_hack depends
> > > > > on your squid.conf configuration (reload_into_ims, or the use
> > > > > of no-cache related options to refresh_pattern).
> > > > >
> > > > > Regards
> > > > > Henrik
Received on Sun Apr 28 2002 - 03:39:16 MDT