[LINK] RFI: How Does the Do-Not-Cache Instruction Work?

[Avi Miller]

On 10/08/2008, at 8:05 PM, Roger Clarke wrote:

> With some web-pages, I can't do a save of the page, nor of images
> within the page.  If I want a copy, I have to do a screen-scrape.

There should be no pages that prevent you from saving the HTML source  
content and images. Some do try to make your life more difficult by  
using JavaScript to disable the right mouse button, but this is easily  
bypassed by either disabling JavaScript or using the Menu -> View  
Source option. Alternatively, sites may use Flash to store and display  
content, which does prevent offline storage.

There are no-cache directives that are used by web applications to  
tell proxy servers and browsers to always re-request content. I found  
this page that has a fairly non-technical explanation of the various  
caching directives that are available in HTTP/1.1:

http://palisade.plynt.com/issues/2008Jul/cache-control-attributes/

Are you able to provide an example URL for a page who's content you  
are unable to save?

cYa,
Avi