On 05/16/2018 09:31 PM, Hans van der Meer wrote:
> I tried to determine the existence of a file on the internet. See the
> following macro call:
>
> % Test if file exists.
> \edef\theurl{\linkprotocol://\urlbase\xmlatt{#1}{link}\thesuffix}
> \doiffileelse
> {\theurl}
> {\verbose{HVDM-PEV-TEST}{file exists: \theurl}}
> {\verbose{HVDM-PEV-TEST}{file does not exist: \theurl}}
>
> It seems that \doiffileelse always results in true except for local
> files where nonexistence is correctly handled.
>
> For example the following url definitely does not exist but nevertheless
> \doiffileelse reports its existence:
> HVDM-PEV-TEST > file exists:
> http://hansvandermeer.myqnapcloud.com/archive/denhaag/hga-dtb-1869-6040.pdf
>
> Is it possible that the \doiffile macros are extended for files on the
> internet or a correponding set \doifurl is developed?
I'm not speaking for the devs here, but I don't think that this is going
to be included. It would require that all webpages send proper 404
codes and timeout after reasonable delay. Also how would you handle
redirects? Should the ConTeXt run be stalled because checking for a
files existence on the web is caught in a redirect loop?
>
> Hans van der Meer
>
>
>
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