Re: Internet Image Capture to Database

["Dean Smith" <ukha@xxxxxxx>]

One of the HTTP headers you can include in an HTTP "GET" request
is
"if-modified-since". The page will then return the object if it
has been
modified since the specified date (usually when you last asked for it) or
an
HTTP 304 error if its the same. Its used extensively by network caches
(and
browsers) etc. to  minimise bandwidth

I'm not sure how you can use it - I don't know wether utilites such as
WGET
can be made conditional on it. I'm sure it could be done with a small
custom
VB app.

Dean

If-Modified-Since

Used with the GET method to make it conditional: if the requested
resource
has not been modified since the time specified in this field, a copy of
the
resource will not be returned from the server; instead, a 304 (not
modified)
response will be returned without any data.


----- Original Message -----
From: <steve.cooper@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Thursday, November 07, 2002 4:15 PM
Subject: RE: [ukha_d] Internet Image Capture to Database


>
> >> How the other PC will know when image changes on your web
site?
>
> Don't know.  File size, datestamp or direct compare of
file.  Just
> wondering if anyone knew of anything, I've tried searching google but
you
> just get lots of references to uploading from webcams or picture
grabbers
> design to grab every picture you view.
>
> S.
>
>
>
>
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