POV-Ray : Newsgroups : povray.general : news image digest Server Time
14 Nov 2024 21:12:57 EST (-0500)
  news image digest (Message 1 to 9 of 9)  
From: Alf Peake
Subject: news image digest
Date: 18 Feb 2005 06:51:37
Message: <4215d6c9$1@news.povray.org>
Anyone else able to view this page?
http://news.povray.org/digest/images/

I've had an empty page the last few days and am not able to see 
anything in OE6->view->source

Alf


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From: Stephen McAvoy
Subject: Re: news image digest
Date: 18 Feb 2005 10:24:00
Message: <5t1c11pl75mj2m0tl1mm81iskfldrnsa1a@4ax.com>
On Fri, 18 Feb 2005 11:51:26 -0000, "Alf Peake"
<alf### [at] peake42freeservecouk> wrote:

>Anyone else able to view this page?
>http://news.povray.org/digest/images/
>
>I've had an empty page the last few days and am not able to see 
>anything in OE6->view->source

The page comes up but it is empty, with Firefox. Refresh made it OK.
IE6 loaded ok but slow.

Regards
        Stephen


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From: Chris Cason
Subject: Re: news image digest
Date: 18 Feb 2005 10:32:21
Message: <42160a85$1@news.povray.org>
Alf Peake wrote:
> Anyone else able to view this page?
> http://news.povray.org/digest/images/
> 
> I've had an empty page the last few days and am not able to see 
> anything in OE6->view->source

thanks for pointing this out, we had some DB corruption. it's working now.

-- Chris


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From: Mike Raiford
Subject: Re: news image digest
Date: 18 Feb 2005 10:42:44
Message: <42160cf4$1@news.povray.org>
Chris Cason wrote:
> Alf Peake wrote:
> 
>>Anyone else able to view this page?
>>http://news.povray.org/digest/images/
>>
>>I've had an empty page the last few days and am not able to see 
>>anything in OE6->view->source
> 
> 
> thanks for pointing this out, we had some DB corruption. it's working now.
> 
> -- Chris

BTW, why does it seem like the nesgroups site is always so painfully slow?

* I'm not knocking the site, I always use a newsreader, but occasionally 
visit the web interface (usually to follow a link to something on the 
groups.. And it always seems to be painfully slow.

-- 
~Mike

Things! Billions of them!


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From: Alf Peake
Subject: Re: news image digest
Date: 18 Feb 2005 11:08:42
Message: <4216130a$1@news.povray.org>
"Chris Cason" <nos### [at] deletethispovrayorg> wrote in 
message news:42160a85$1@news.povray.org...
> Alf Peake wrote:
>> Anyone else able to view this page?
>> http://news.povray.org/digest/images/
>>
>> I've had an empty page the last few days and am not able to see
>> anything in OE6->view->source
>
> thanks for pointing this out, we had some DB corruption. it's 
> working now.
>
> -- Chris

You're welcome. OK now. Thanks for the quick-fix.
BTW I meant IE6, not OE6 :c/

Alf


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From: Alf Peake
Subject: Re: news image digest
Date: 18 Feb 2005 11:13:58
Message: <42161446@news.povray.org>
"Mike Raiford" wrote:
> * I'm not knocking the site, I always use a newsreader, but 
> occasionally visit the web interface (usually to follow a link to 
> something on the groups.. And it always seems to be painfully slow.

I'm using dial-up so use web view of p.b.i for images > around 200KB. 
Some of the images lately are way over the top at +600KB. I guess the 
posters assume everyone is on broadband.

Alf


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From: Thorsten Froehlich
Subject: Re: news image digest
Date: 18 Feb 2005 11:14:15
Message: <42161457$1@news.povray.org>
Mike Raiford wrote:
> BTW, why does it seem like the nesgroups site is always so painfully slow?

There are two possible patterns you see, both related to the same technical 
measure:

1. First, the initial view after a few minutes of inactivity (or visiting 
for the first time in a new session) is slow.

The web interface is designed such that is prevents anybody from easily 
making a full snapshot of the whole page against our wishes.  Google is an 
exception, but they obey no-cache and no-index options the website tells 
them about, which most "web mirror" programs do not.

Either way, the trick we use to protect the website from massive downloads 
is that with each access you get a cookie set that contains a counter of the 
number (and just that, we don't track the pages or anything like that) of 
page views in the last several minutes as well as the current time. The 
counter and time are validated with a hash key so it cannot easily be 
manipulated by someone just editing their cookies.  This also makes it 
harder for someone to simply send a non-modifiable cookie, as the time is 
part of the key.

Now, when you access the page for the first time after several minutes, the 
server gets a cookie and notices that its time is too old.  So what it does 
is to simply wait and do nothing for a few seconds (ten iirc) before it 
sends you the first page.  Cookies are updated in your browser with every 
page view, so when you navigate the page actively, you can do so quickly 
without the delay (unless you hit something like more than 20 or so pages 
per minute, but I don't recall the exact limit we set).

2. The view is always slow with every access.

However, if you disabled cookies for the povray.org website in your browser, 
the server will never get a cookie and impose the delay with each access. 
By default the cookies as sent by povray.org to your browser should be 
accepted with the default settings of any browser, but if you use maximum 
security settings (depending on your browser), they might be rejected 
automatically by your browser on your behalf.  In that case you need to 
change your browser setting to allow cookies from povray.org if you want a 
fast site.


In summary, it is not something just you see but that we impose on every 
user in order to protect the contents of this server as good as possible to 
prevent misuse of the message contents.

	Thorsten


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From: Mike Raiford
Subject: Re: news image digest
Date: 18 Feb 2005 13:14:01
Message: <42163069$1@news.povray.org>
Thorsten Froehlich wrote:

> 1. First, the initial view after a few minutes of inactivity (or 
> visiting for the first time in a new session) is slow.
> 
> The web interface is designed such that is prevents anybody from easily 
> making a full snapshot of the whole page against our wishes.  Google is 
> an exception, but they obey no-cache and no-index options the website 
> tells them about, which most "web mirror" programs do not.

Hm. So I'm not nuts after all.. :)

This is pretty much what I observe.

It's amazing how a few bad apples can spoil things for everyone involved. :)

-- 
~Mike

Things! Billions of them!


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From: Chris Cason
Subject: Re: news image digest
Date: 18 Feb 2005 16:21:38
Message: <42165c62$1@news.povray.org>
Mike Raiford wrote:
> It's amazing how a few bad apples can spoil things for everyone involved. :)

BTW one of the other major reasons we have that system in place is to slow
down web scraping robots that go in looking for email addresses.


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