Re: cache issue

Howdy:

   Though this is a few days old, I didn't see any other responses to 
it...

On 07/17/2000 06:32 USA PT (-0800), evan@xxxxxxxxx ( Evan Trent ), 
wrote...

>One thing I would like to ask about is WebTen's caching. I have found that 
>if I
>modify a file and upload it via FTP, Internet Explorer and Netscape both 
>fail to
>display the latest version of the file. IE is the worse offender... you 
>CANNOT
>get it to display the new verison no matter what you do. Empty Cache, 
>Refresh,
>etc. Nothing helps.
   Due to WT using the Squid caching ( for speed ) I've found that page 
updates need a "refresh" command from a browser to become active.  
Unfortunately, IE is not the browser to do that with easily.

>Netscape doesn't display the new version if you bring up a window with the
>appropriate URL... but if you refresh it usually gets the new version for 
>you.
   True.

>I can't figure out what the problem is... but after turning off WebTen's 
>cache
>the problem has gone away.
   Makes sense.  No cache, direct access to pages, no problem.

>Is there some sort of configuration for the cache or is this just because IE
>sucks (this is certainly not news to me)?
   Below my signature is a note from the WebTen FAQs concerning some 
problems with viewing recently changed pages.

>Also is IE ever going to fix the damn forms bug that prevents us from 
>remotely
>adminning WebTen? It's ironic because Netscape can't remember your logon name
>and PW so remote adminning with it is a pain :) I'd rather it have the 
>form bug
>than IE :D lol
   That's probably a question best addressed to the MS IE team.

   Hope that helps.

Glenn

===========

Question: I regularly update documents on the web server, but the updates 
never seem to appear. What's wrong?

 Answer: It is important to understand how caching works on a web server, 
and in a web browser. Here is a hypothetical scenario that will explain 
the issue:

WebTen is operating under normal conditions and a commonly-accessed page 
is located in the Squid cache. A browser requests this page and it is 
transmitted by Squid without checking to see if the page has updated. 
This is where WebTen's speed comes from. Now, if a browser "Reload" 
request is given by the browser to Squid, Squid will check to see if the 
page has updated and it will serve the latest copy. If a "Super-reload" 
request is given to Squid it will serve the page from disk no matter what.

 Squid keeps commonly-accessed pages in its cache for three days. Once 
this time has expired, Squid automatically dumps the contents of its 
cache and commonly-accessed pages are stored in cache as they are 
accessed.

 Netscape has an option entitled "Page in cache is compared to page on 
Network". The options for this feature are: "Once per session", "Every 
time", and "Never". If Netscape is set to "Never", it will never ask 
Squid if the page is updated! If the option is set to "Once per session", 
Netscape will ask once if the page has been updated, and if the option is 
set to "Every time", Netscape will always ask Squid if it has the latest 
document. Tenon recommends that you set your Netscape settings to verify 
documents "Every time". This gives you the maximum "Reload" 
functionality. To force Netscape to do a "Super-reload", simply hold down 
the "option" key while clicking "Reload" on Macintosh systems, and hold 
down the shift key while clicking "Reload" on all other platforms.

 Unfortunately, Internet Explorer does not have the cache options that 
Netscape does. The best IE can do is a "normal" reload which is initiated 
by holding down the shift key and clicking the reload button. Numerous 
users have encountered problems with IE because it rarely (sometimes 
never) checks to see if the page on the network has changed and will only 
serve up documents out of its cache. Until Internet Explorer handles 
caching properly, we strongly recommend against using IE for web-page 
verification.

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