I would be satisfied when a returned 404 error code will be handled within a
reasonable (configurable) time delay. As for redirection, there I would not
mind if it is not included.
Restrictions like that are not a problem for me, because this is for building a
pdf that accesses many internet located files. The check on existence is
therefore especially meant for spotting missing or misnamed files.
Hans van der Meer
> On 16 May 2018, at 12:41, Henri Menke <henrime...@gmail.com> wrote:
>
> 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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