# [NTG-context] Files on a server

Hans van der Meer havdmeer at ziggo.nl
Wed May 16 13:23:35 CEST 2018

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 <henrimenke at 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.
>>         \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
>>
>>
>>
>> ___________________________________________________________________________________
>> If your question is of interest to others as well, please add an entry to the Wiki!
>>
>> maillist : ntg-context at ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>> wiki     : http://contextgarden.net
>> ___________________________________________________________________________________
>>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context at ntg.nl <mailto:ntg-context at ntg.nl> / http://www.ntg.nl/mailman/listinfo/ntg-context <http://www.ntg.nl/mailman/listinfo/ntg-context>