let me look into it ... I don't think adding that info is particularly
difficult, just a matter of adding a couple of 'headers()' functions to
the PHP on top ... added to my TODO list ...
On Tue, 13 Jan 2004, Oleg Bartunov wrote:
> Hi there,
>
> crawling of archives.postgresql.org is a pain, because there are no
> last-modified information in headers and crawler have to download message
> again. For example:
>
> megera@mira:~$ curl -I http://archives.postgresql.org/pgsql-hackers/2004-01/msg00282.php
> HTTP/1.1 200 OK
> Date: Tue, 13 Jan 2004 17:38:26 GMT
> Server: Apache/1.3.28 (Unix) PHP/4.3.3RC1
> X-Powered-By: PHP/4.3.3RC1
> Content-Type: text/html
>
> Is't possible to add, at least, header 'Last-Modified', so crawler could
> understand if this page should be downloaded again ? It'll save bandwidth
> and time to crawle. I think the best way to set 'Last-Modified' header
> to date of message from 'Date:' field. Of course, there are should be
> proof from 'bad clocks', so default time may be arrival time.
>
> Also, it could be useful to add 'Expires' header.
> I think, headers should be added only to pages with individual message, not
> to indexes, because index pages are indeed changed.
>
> I don't think it's very difficult, but it help site and people.
>
>
> btw, I use cacheability to check if page could cached:
>
http://www.sai.msu.su/admin/cacheability/?query=http%3A%2F%2Farchives.postgresql.org%2Fpgsql-hackers%2F2004-01%2Fmsg00282.php&descend=on
>
> http://archives.postgresql.org/pgsql-hackers/2004-01/msg00282.php
> Expires -
> Cache-Control -
> Last-Modified -
> ETag -
> Content-Length - (actual size: 13277)
> Server Apache/1.3.28 (Unix) PHP/4.3.3RC1
>
> This object will be considered stale, because it doesn't have any freshness
> information assigned. It doesn't have a validator present. It doesn't have a Content-Length header present, so it
can'tbe used in a HTTP/1.0 persistent connection.
>
>
>
>
>
> Regards,
> Oleg
> _____________________________________________________________
> Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
> Sternberg Astronomical Institute, Moscow University (Russia)
> Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
> phone: +007(095)939-16-83, +007(095)939-23-83
>
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