On Sun, 16 Jun 2002, Chris Withers wrote:
BTW: This list if for development *of* Zope, the [EMAIL PROTECTED] list is
better for questions bout developing *with* Zope.
Thanks for your codes indeed. I posted it here because I thought only
people have high developing skill care about whether their web
pages are up-to-date to their readers and so care the HTTP Last-modified
header.
Why do you think that? Surely all zope users will care about this? ;-)
Besides, that's not the point, re-read Casey's email more carefully...
I don't think so. There are quite ofter a user should click CTRL and the
refresh button to get the up-do-date page. This is because the
Last-modified header not properly set. If DTML doesn't care about the
modification time of it's code segments, it will definitely returns the
template's modification time although the contents are keep on changing.
My conclution is that if DTML doesn't do this or dosen't provide a simple
way to do that, Zope may not care about the header at all. So dynamic webpage
authors with basic skill could never control it. Only people have developing
skill may do. Am I right?
Here is Casey's email:
There is no automatic way in which DTML can do this for you. This is
simply because dtml-var foo doesn't tell Zope what foo is. Is it a
No mater what foo is, there is surely a last modification time of foo.
If it is a document. that's easy. If it is a script, there should be a
method like self.setLastModificationTime(scriptTime). This method should
decide if scriptTime is newer than DTML document's own update time and set
it if so. Then it's up to the script writer to call the method with the
current time if he/she want to disable browser's caching function.
document or a script that returns something different every time it is
called or something else? In fact foo might different things at
different times, if you aquire the template into different contexts.
What stops the main DTML document from knowing the last modification time
of foo?
In fact, Casey's script is just a walk-around. Script writers should
manually create a list containing all code segments he/she dtml-vared.
(Sorry for using this phrase to express my disagreement on choosing
dtml-var against dtml-include). It's a boring task if there are many
nested code segments included.
I'm a PHP user for several years and I'm try to migrate part of my
projects to Zope. Changing from PHP to DTML/Python is not a big deal.
But I'm so used to the easy environment PHP provides coders.
Wei He
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