DALI: HTTP errors and VOTable

[Laurent MICHEL]

Hello,

I'd just come back to the Pat's proposal about the handling of HTTP 
errors in DALI.
The question was to require (or not) services compliant with DALI to 
return a VOTable in case of HTTP error 4xx or 5xx.
 From my point of view, there is at least one strong technical reason 
pleading against this requirement.

If the Dali application is running on a Tomcat server and if it has been 
unpublished from some reason, then Tomcat returns an error 404. If Dali 
requires a VOTable top be returned, Tomcat must be configured to return 
this VOTable. That can be conflicting with other services running on the 
same server (I don't know if a per application setup can be set at 
server level). In any cases, DALI specifications shouldn't go out of the 
application scope.

So I suggest to keep this optional.

Bye
LM


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