From: "Dick Applebaum" <[EMAIL PROTECTED]>
> I think you can check if a file exists with CFFTP
>
That's work (or just FileExists() ) if the calling template was
on the same server as the stored files. Unfortunately, it
appears that the downloads are elsewhere so the point about
<cfhttp> only producing http headers after transfer of the
file remains.
What I'd do (other than looking for a http tool that GETs just
response headers) is check a stored value based on the last
attempt to get the file. I.E., the very first time the file is
downloaded by calling the local template store the value of the
header. The next time, and in all subsequent calls, check that
variable before getting. If the last attempt showed that the
call failed - give the user the choice of continuing or not.
Give them the info as to when the last successful download
occurred. The availabiity info will be stale according to the
datetime of the last successful attempt.
Alternatively - maybe contacting the hosts of the large files
and requesting they make file availabioty data easily accessible
would solve the problem. Much easier to <cfhttp> a page that
is checking its own downloads and then proceed based on
that kind of return.
Until a tool that returns just headers is found, either of the
above will work ....
Pan "off to look for that tool"
>
> At 1:43 PM +1000 10/15/00, Rob Keniger wrote:
> >Hi,
> >
> >I have a client who has several links to largish (up to 100MB) downloads
> >which are hosted on other people's servers. He wants my CF app to
> >automatically check all these URLs to ensure they are still valid (i.e. not
> >giving 404's).
> >
> >I thought about using CFHTTP but from what I know of it you would have to
> >download the entire linked file before you could determine whether or not
> >the link was valid. If the client has, say, several hundred downloads at
> >10-100MB apiece then this is obviously not feasible in terms of time, disk
> >space and bandwidth. Is there any way to use CF to do this? If CFHTTP won't
> >do the job, is there an alternative?
> >
> >Thanks for any input.
> >
> >--
> >
> >Rob Keniger
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