How to not cache all elements of a web page download?

[Ron Lessnick]

I have to continuously download the same web page on our IIS server. It is
important to always download a fresh page from the server including not only
the .asp page itself but all the .gif and .jpg files associated with that
page. We need to measure statistical info on how long it takes to download.
If the page is stored in the client machines internet cache that would be a
problem.
Now I know how to add the following to the main .asp page to insure a fresh
copy is always downloaded of this page itself.
<% Response.Expires = -2000 %>

When I look at the client machines cache folder it does show that the main
..asp page has expired an hour ago. However
all the .gifs and .jpgs , etc downloaded with the main .aps page show the
value Expire: None which I conclude means that these pieces are not
redownload each time we get the main .asp page.

Up till now we have been using a perl script to try and erase the cache
before each download . This works sometimes but not all the time.

Is there any way to force the .gifs, .jpgs etc. to have to download fresh
each time just like I was able to get the main .asp page to redownload with
<% Response.Expires = -2000 %>

TIA
Ron

[Curt_C [MVP]]

cheat....
Just add a random string/character to the end of the URL link... that makes
the browser always think its a new page.
It's a bit of a kludge but it works

--
Curt Christianson
Site & Scripts: http://www.Darkfalz.com
Blog: http://blog.Darkfalz.com
"Ron Lessnick" <le******@lucent.com> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

I have to continuously download the same web page on our IIS server. It is
important to always download a fresh page from the server including not
only
the .asp page itself but all the .gif and .jpg files associated with that
page. We need to measure statistical info on how long it takes to
download.
If the page is stored in the client machines internet cache that would be
a
problem.
Now I know how to add the following to the main .asp page to insure a
fresh
copy is always downloaded of this page itself.
<% Response.Expires = -2000 %>

When I look at the client machines cache folder it does show that the main
.asp page has expired an hour ago. However
all the .gifs and .jpgs , etc downloaded with the main .aps page show the
value Expire: None which I conclude means that these pieces are not
redownload each time we get the main .asp page.

Up till now we have been using a perl script to try and erase the cache
before each download . This works sometimes but not all the time.

Is there any way to force the .gifs, .jpgs etc. to have to download fresh
each time just like I was able to get the main .asp page to redownload
with
<% Response.Expires = -2000 %>

TIA
Ron

[[MSFT]]

If your images on the ASP page need updated everytime, you may not use a
static url link to a image. Instead, you may use a link to a ASP page which
read image file on server side and write binary data to Response. This can
force it refresh everytime.

Luke

[Ron Lessnick]

Thanks for the replies.

I used Curt's Method and it works fine.

i.e.; <IMG height=110
src="CNET_com_files/2ghz.gif?<%=someRandomNumberVarible%>" width=85

"[MSFT]" <lu******@online.microsoft.com> wrote in message
news:DX**************@cpmsftngxa10.phx.gbl...

If your images on the ASP page need updated everytime, you may not use a
static url link to a image. Instead, you may use a link to a ASP page which read image file on server side and write binary data to Response. This can
force it refresh everytime.

Luke